High Consistent Gets and memory settings

What is actually high consistent gets?
I get High Consistent Gets for certain sessions. Following are some of my parameter settings.
db_16k_cache_size = 0
db_2k_cache_size = 0
db_32k_cache_size = 0
db_4k_cache_size = 0
db_8k_cache_size = 0
db_block_size = 8192
sga_max_size = 7632M
sga_target = 7632M
shared_pool_reserved_size = 119957094
shared_pool_size = 48M
pga_aggregate_target = 1500M
Will setting AMM by configuring following parameter help Oracle to manage the memory in terms of workload and reduce CONSISTENT GETS?
Or do I need to manually configure parameter such as "db_8k_cache_size".?
memory_max_target = my SGA+PGA: 9.5G
memory_target = my SGA+PGA: 9.5G
sga_target = 0
pga_agreegate_target =0
Regards, Lily

Lily wrote:
What is actually high consistent gets?These are the logical IO's . If the logical IOs are high, it may mean that you have selected a lot of data which is now supposed to be given back to you. The high Logical IOs is not something that you should try to minimize using a high amount of memory since its already cached data. That sort of workaround works or would work if the physical IOs are high. If the session is doing more logical IO's check the query and the selectivity of the data and see if you can limit it further.
I get High Consistent Gets for certain sessions. Following are some of my parameter settings.
db_16k_cache_size = 0
db_2k_cache_size = 0
db_32k_cache_size = 0
db_4k_cache_size = 0
db_8k_cache_size = 0
db_block_size = 8192
sga_max_size = 7632M
sga_target = 7632M
shared_pool_reserved_size = 119957094
shared_pool_size = 48M
pga_aggregate_target = 1500M
Will setting AMM by configuring following parameter help Oracle to manage the memory in terms of workload and reduce CONSISTENT GETS?
Or do I need to manually configure parameter such as "db_8k_cache_size".?
memory_max_target = my SGA+PGA: 9.5G
memory_target = my SGA+PGA: 9.5G
sga_target = 0
pga_agreegate_target =0
As I said, instance tuning is not something that you should aim for .
Aman....

Similar Messages

Consistent gets and db block gets

Hi...
I wanted to know the difference between consistent gets and db block gets in v$sess_io.I have read that consistent gets is the blocks in consistent mode..so here what does consistent mode means????
Thanks in Advance,
Anand

Here's the complete text of the answer I originally wrote nearly 5 years ago on the Oracle-L mailing list:
A 'db block get' is a current mode get. That is, it's the most up-to-date copy of the data in that block, as it is right now, or currently. There can only be one current copy of a block in the buffer cache at any time. Db block gets generally are used when DML changes data in the database. In that case, row-level locks are implicitly taken on the updated rows. There is also at least one well-known case where a select statement does a db block get, and does not take a lock. That is, when it does a full table scan or fast full index scan, Oracle will read the segment header in current mode (multiple times, the number varies based on Oracle version).
A 'consistent get' is when Oracle gets the data in a block which is consistent with a given point in time, or SCN. The consistent get is at the heart of Oracle's read consistency mechanism. When blocks are fetched in order to satisfy a query result set, they are fetched in consistent mode. If no block in the buffer cache is consistent to the correct point in time, Oracle will (attempt to) reconstruct that block using the information in the rollback segments. If it fails to do so, that's when a query errors out with the much dreaded, much feared, and much misunderstood ORA-1555 "snapshot too old".
As to latching, and how it relates, well, consider that the block buffers are in the SGA, which is shared memory. To avoid corruption, latches are used to serialize access to many linked lists and data structures that point to the buffers as well as the buffers themselves. It is safe to say that each consistent get introduces serialization to the system, and by tuning SQL to use more efficient access paths, you can get the same answer to the same query but do less consistent gets. This not only consumes less CPU, it also can significantly reduce latching which reduces serialization and makes your system more scalable.
Well, that turned out longer than I planned. If you're still reading, I hope it helped!
Hope that helps,
-Mark
PS The original question asked about latching as well, which explains the reason for the third paragraph.
Edited by: mbobak on Sep 2, 2008 11:07 PM

Consistent gets and buffer gets

Hi,
what is the difference between Consistent gets and buffer gets ?
Many thanks before.

plz the documentation is your friend. You can search from tahiti.oracle.com or 10.2 (or your version) docu library.

P7N SLI Plat. and memory settings

Hey guy! Again, great forums! Thanks for all the help. Noob question coming up.
I have a couple of questions about the P7N SLI Platinum and memory settings. Oh, before I begin, let me say that I bought this stuff as part of deal, and ended up with the 1066 ram.
I have a few options under my belt, and I don't know which would be the best. I'm also looking for some kind of software to test RAM speeds; test between MHZ and timings performance? Does Sandra do that? Anyone know of any other programs?
Some recommend that I run 1:1 FSB:RAM ratio (looks like the most favored), but some say some boards can do better if everything is running as fast as it can, and not to worry about the ratio.
So which is it with the P7N, which is a 750i chipset?
Here's the rest of the situation:
I have a set of 2x2GB DDR2 1066 5-5-5-15; 2T @2.1v.
I have a Q6600 2.4GHz @ 3.0Ghz (1333x9) OC-ed.
I have run this memory at 1066 on this board with no hitches (overclocking the board essentially, but it handles it like a champ)
I can also run it at 800; but I have not tried tighter timings on this.
I can run it at 667 and lower timings to 4-4-4-14; 1T with no problems (so far). This gives me a 1:1 ratio as well.
This is what I am running right now.
What should I do with this board and this CPU? Should I keep 1:1 and tighten timings? I don't know if I can go below 4-4-4-14; I haven't tried yet.
Or should I run at 1066 with the stock timings?
I have been reading, but I keep hearing conflicting information (though I will admit, it's hard to find info that is very recent; articles varied from '06-'08) Some say 1:1 is best, others say that it's not necessary these days, with modern boards?
The different performance preferences also seem to vary from chipset to chipset? Is that correct?
Thank You very much for helping a lost noob!

Remus this is no bulldash, i had two 1GB DDR2 1066 cl5 1.8 volt and i sold it on ebay a week ago for £21.00 . i used it on my p6 which would take only ddr2 800 (it ran at 800mhz 1.8 volt but these were not suitable at all in terms of stability) and also on my asus which would take ddr21066 but only after overclocking fsb but keeping the default voltage at 1.8volt. those who say ddr2 1066 1.8 volt does not exist should review their comments. i believe crucial does ddr2 1066 1.8 volt and also ddr2 1066 2.1 volt
here is the proof of ebay
http://s240.photobucket.com/albums/ff177/kourosh22/?action=view&current=ScreenShot077.jpg
http://s240.photobucket.com/albums/ff177/kourosh22/?action=view&current=ScreenShot076.jpg
a memory has an oscillator and we refer to them as 800mhz or 1066mhz. because memory sticks have 240 terminals or pins for transfer of data in order to be able to increase the rate of transfer not only the oscillator speed has to be increased other parameters has to change.
DDR2 1066 1.8 volt is a memory which it's oscillator oscillate at 1066mhz when 1.8 volt is applied to, it's terminals with cas latency 5 or Cl5.
DDR2 1066 2.1 or 2.2 volt is a memory which it's oscillator oscillate at 1066mhz when 2.1 or 2,2 voltage is applied to it's terminals otherwise it will oscillate at 800mhz. these kind of DDR2 1066 are referred to as DRR2 800 overclocked.

Gt70 2pc dominator Lag/stutter and high hard disk and memory usage

After Receiving the gt70 back from repairs (was repaired by msi) and installing some games my notebook started high disk usage and system responsiveness decreased very noticably i thought it was temporarily but it wasn't. When i played games i noticed stutters from time to time and i can see the hard drive Led being lit up completely when it happens, when i go to task manager i can see about 87% memory utilization but isn't about 3gb usage and hard drive being at 100% usage (even in idle most of time) and isn't using 3 mb/s, i'm not an expert with software related problems so i hope you go easy on me and thanks for your help.
EDIT: Sometimes the pc crashes and give me this notification "system thread exception not handled" i searched and says it's due to bad driver and requires booting from windows cd but obviously it is an embedded windows so i don't know what to do. Another problem which is minor is when i try to shutdown it says "please wait" and then boots into windows again, i have to restart and then shutdown or press the power button to shut it down.

You can refer the following links:
http://www.msi.com/faq/nb-740.html
http://www.msi.com/faq/nb-646.html
And also suggest to disable Windows Update, any antivirus activities, or unwanted processes.

Consistent gets and physical reads

Hi all,
I am tuning a DM SQL query, by comparing execution plans with STAR TRANSFORMATION enabled or disabled. I got the following results:
STAR TRANSFORMATION ON
74889 consistent gets
254365 physical reads
STAR TRANSFORMATION OFF
1945892 consistent gets
168028 physical reads
I thought a physical read would be counted as a logical read as well, because the data block would be read from disk (1 physical IO), placed in the buffer cache and then read from there (1 more logical IO or consistent get).
So, one physical IO does not cause a logical IO?
Thanks!
Edited by: user10634835 on 12-Jul-2011 08:40

But shouldn't consistent gets be >= physical reads (Since, as per my understanding, 1 PIO causes at least 1 LIO)? In this case it is not.
74889 consistent gets
254365 physical readsJust clarifying for my knowledge.
regards

What causes BUFFER GETS and PHYSICAL READS in INSERT operation to be high?

Hi All,
Am performing a huge number of INSERTs to a newly installed Oracle XE 10.2.0.1.0 on Windows. There is no SELECT statement running, but just INSERTs one after the other of 550,000 in count. When I monitor the SESSION I/O from Home > Administration > Database Monitor > Sessions, I see the following stats:
BUFFER GETS = 1,550,560
CONSISTENT GETS = 512,036
PHYSICAL READS = 3,834
BLOCK CHANGES = 1,034,232
The presence of 2 stats confuses. Though the operation is just INSERT in database for this session, why should there be BUFFER GETS of this magnitude and why should there by PHYSICAL READS. Aren't these parameters for read operations? The BLOCK CHANGES value is clear as there are huge writes and the writes change these many blocks. Can any kind soul explain me what causes there parameters to show high value?
The total columns in the display table are as follows (from the link mentioned above)
1. Status
2. SID
3. Database Users
4. Command
5. Time
6. Block Gets
7. Consistent Gets
8. Physical Reads
9. Block Changes
10. Consistent Changes
What does CONSISTENT GETS and CONSISTENT CHANGES mean in a typical INSERT operation? And does someone know which all tables are involved in getting these values?
Thank,
...

Flake wrote:
Hans, gracias.
The table just have 2 columns, both of which are varchar2 (500). No constraints, no indexes, neither foreign key references are in place. The total size of RAM in system is 1GB, and yes, there are other GUI's going on like Firefox browser, notepad and command terminals.
But, what does these other applications have to do with Oracle BUFFER GETS, PHYSICAL READS etc.? Awaiting your reply.Total RAM is 1GB. If you let XE decide how much RAM is to be allocated to buffers, on startup that needs to be shared with any/all other applications. Let's say that leaves us with, say 400M for the SGA + PGA.
PGA is used for internal stuff, such as sorting, which is also used in determing the layout of secondary facets such as indexes and uniqueness. Total PGA usage varies in size based on the number of connections and required operations.
And then there's the SGA. That needs to cover the space requirement for the data dictionary, any/all stored procedures and SQL statements being run, user security and so on. As well as the buffer blocks which represent the tablespace of the database. Since it is rare that the entire tablespace will fit into memory, stuff needs to be swapped in and out.
So - put too much space pressure on the poor operating system before starting the database, and the SGA may be squeezed. Put that space pressure on the system and you may enbd up with swapping or paging.
This is one of the reasons Oracle professionals will argue for dedicated machines to handle Oracle software.

High CPU and memory use on Skype 7.4

Hello Skype Community,
Since we have release Skype 7.4 for Windows desktop we have seen a small number of users reporting sometimes high CPU usage and memory consumption by the Skype app.
We are aware of the issue and are working to identify the root causes and identify all the conditions (internal and external) leading to abnormal memory and processor usage. Thanks for your reports confirming our internal telemetry.
I am going to update this topic weekly with an update (or earlier should any news arise).

For further investigation of high CPU issues- Download process manager from https://technet.microsoft.com/en-us/library/bb896645.aspx- Open the filter window <filter><filter>- add the filter <processname> <is> <skype.exe>- close the filter window- clear events <ctrl-x>- start capturing if it is not capturing already with <file><capture events>- wait for about 10 seconds- stop capturing events <file> <capture events> You should have only a few 100 events, if you have more(even 10s of thousands) you can find out under <tools> <any summary> what has taken a lot of time and post your findings in the thread for further info. I found the root cause for my high CPU problem by doing this:http://community.skype.com/t5/Windows-desktop-client/High-CPU-7-5-Solved/m-p/3992130

Reduce Logical IO [db block gets/consistent gets]

Hi,
Still I'm unsure about the Logical IO (db block gets + consistent gets).
I want to reduce 'consistent gets' for this query
SQL> set autotrace traceonly
SQL> select * from cm_per_phone_vw;
905 rows selected.
Execution Plan
Plan hash value: 524433310
| Id | Operation                    | Name         | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT             |              |   868 | 38192 |     8   (0)| 00:00:01 |
|   1 | SORT GROUP BY NOSORT        |              |   868 | 38192 |     8   (0)| 00:00:01 |
|   2 |   TABLE ACCESS BY INDEX ROWID| CI_PER_PHONE | 1238 | 54472 |     8   (0)| 00:00:01 |
|   3 |    INDEX FULL SCAN           | CM172C0      | 1238 |       |     1   (0)| 00:00:01 |
Statistics
          8 recursive calls
          0 db block gets
        922 consistent gets
          4 physical reads
          0 redo size
      39151 bytes sent via SQL*Net to client
       1045 bytes received via SQL*Net from client
         62 SQL*Net roundtrips to/from client
          0 sorts (memory)
          0 sorts (disk)
        905 rows processedFollowing is the view it's accessing
CREATE OR REPLACE VIEW CM_PER_PHONE_VW
AS
SELECT
per_id
, MAX(DECODE(TRIM(phone_type_cd), 'MOB', phone)) AS MOB
, MAX(DECODE(TRIM(phone_type_cd), 'HOME', phone)) AS HOME
, MAX(DECODE(TRIM(phone_type_cd), 'BUSN', TRIM(phone) || ' ' || TRIM(extension))) AS BUSN
, MAX(DECODE(TRIM(phone_type_cd), 'FAX', phone)) AS FAX
, MAX(DECODE(TRIM(phone_type_cd), 'INT', phone)) AS INT
FROM
ci_per_phone
GROUP BY
per_idI have following indexes on table ci_per_phone
INDEX_NAME                     COLUMN_NAME                    COLUMN_POSITION
XM172P0                        PER_ID                                       1
XM172P0                        SEQ_NUM                                      2
XM172S1                        PHONE                                        1
CM172C0                        PER_ID                                       1I tried creating indexes on PER_ID and PHONE_TYPE_CD but the consistent gets reduces to 920 instead of 922.
Just for curiosity, how can I reduce this?
secondly, is there any explanation on 'OPERATION' break of the plan, e.g. TABLE ACCESS BY INDEX ROWID ?
Please advice.
Luckys.

Further I'm having problem with another query which is a view
CREATE OR REPLACE VIEW CM_PER_CHAR_VW
AS
SELECT
/*+ full (a) */
a.acct_id
, MAX(DECODE(a.char_type_cd, 'ACCTYPE', a.char_val)) acct_type
, MAX(DECODE(a.char_type_cd, 'PRVBLCYC', a.adhoc_char_val)) prev_bill_cyc
FROM
ci_acct_char a
WHERE
a.effdt =
    (SELECT
      MAX(a1.effdt)
    FROM
      ci_acct_char a1
    WHERE a1.acct_id = a.acct_id
    AND a1.char_type_cd = a.char_type_cd)
GROUP BY
a.acct_idI'm not able to reduce the consistent gets and even the filter appears.
I've analyzed the table as well as the index on the table.
cisadm@CCBDEV> select * from cm_acct_char_vw;
2649 rows selected.
Execution Plan
Plan hash value: 132362271
| Id | Operation              | Name         | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT       |              |    27 | 4536 |    14   (8)| 00:00:01 |
|   1 | HASH GROUP BY         |              |    27 | 4536 |    14   (8)| 00:00:01 |
|   2 |   VIEW                 |              |    27 | 4536 |    14   (8)| 00:00:01 |
|* 3 |    FILTER              |              |       |       |            |          |
|   4 |     HASH GROUP BY      |              |    27 | 2916 |    14   (8)| 00:00:01 |
|   5 |      NESTED LOOPS      |              | 2686 |   283K|    13   (0)| 00:00:01 |
|   6 |       TABLE ACCESS FULL| CI_ACCT_CHAR | 2686 |   157K|    12   (0)| 00:00:01 |
|* 7 |       INDEX RANGE SCAN | XM064P0      |     1 |    48 |     1   (0)| 00:00:01 |
Predicate Information (identified by operation id):
   3 - filter("A"."EFFDT"=MAX("A1"."EFFDT"))
   7 - access("A1"."ACCT_ID"="A"."ACCT_ID" AND
              "A1"."CHAR_TYPE_CD"="A"."CHAR_TYPE_CD")
Statistics
          0 recursive calls
          0 db block gets
       2754 consistent gets
          0 physical reads
          0 redo size
      76517 bytes sent via SQL*Net to client
       2321 bytes received via SQL*Net from client
        178 SQL*Net roundtrips to/from client
          0 sorts (memory)
          0 sorts (disk)
       2649 rows processedhere's the tkprof
select *
from
cm_acct_char_vw
call     count       cpu    elapsed       disk      query    current        rows
Parse        2      0.00       0.00          0          0          0           0
Execute      1      0.00       0.00          0          0          0           0
Fetch      178      0.07       0.05          0       2754          0        2649
total      181      0.07       0.05          0       2754          0        2649
Misses in library cache during parse: 1
Optimizer mode: CHOOSE
Parsing user id: 63 (CISADM)
Rows     Execution Plan
      0 SELECT STATEMENT   MODE: CHOOSE
      0   HASH (GROUP BY)
      0    VIEW
      0     FILTER
      0      HASH (GROUP BY)
      0       NESTED LOOPS
      0        TABLE ACCESS   MODE: ANALYZED (FULL) OF 'CI_ACCT_CHAR'
                   (TABLE)
      0        INDEX   MODE: ANALYZED (RANGE SCAN) OF 'XM064P0'
                   (INDEX (UNIQUE))
Elapsed times include waiting on following events:
Event waited on                             Times   Max. Wait Total Waited
----------------------------------------   Waited ---------- ------------
SQL*Net message to client                     179        0.00          0.00
SQL*Net message from client                   179        0.00          0.08
********************************************************************************I've an similar query for another table, where there are 1110 rows, but in the explain, no filter appears in the predicate
Predicate Information (identified by operation id):
   2 - access("P"."EFFDT"="VW_COL_1" AND "PER_ID"="P"."PER_ID" AND
              "CHAR_TYPE_CD"="P"."CHAR_TYPE_CD")Both the queries have somewhat similar views.
I've got 2 questions,
Is there a way I can reduce the consistent gets( I've tried with/without HINTS),
secondly whats the predicate access shows as 'VW_COL_1'
please advice.

No physical reads, plenty of consistant gets

Hi All,
Oracle v11.2 on Linux.
Please have a look at the query I ran and the output. The SQL_ID is of a SELECT command.
What does this situation represents, where there are zero physical reads and plenty of consistant gets ?
For consistant gets, we do read undo information (correct ??), if that undo is read from disk, will that be a "physical read"? i.e. if we read disks for consistant gets, will that be counted under physical reads or not ?
How can I describe the exact data retrival of the command here? Is it the case of "everything it needs is found in the buffer cache" ?
select a.sid, a.value , B.NAME , s.sql_id
from v$sesstat a, v$statname b, v$session s
where A.STATISTIC# = B.STATISTIC#
and b.name in ( 'redo size','physical read bytes','physical reads cache','consistent gets' )
and a.sid = s.sid
and a.sid=1018
order by a.sid;
       SID      VALUE NAME                                                             SQL_ID
      1018    7281396 consistent gets                                                  434u36htuz0s9
      1018          0 physical reads cache                                             434u36htuz0s9
      1018          0 physical read bytes                                              434u36htuz0s9
      1018       4448 redo size                                                        434u36htuz0s9
4 rows selected.Thanks in advance.

>
There are no physical reads, so weather its doing consistant-gets or not, can I say, all data required for the SELECT was in buffer cache ?
>
The data for those system views is cached in memory so Oracle does not read the disk (except at startup) to gather the information.
Some static information, like dictionary objects, is stored stored on disk in the system tablespace but this data is read when the database is mounted and stored in memory structures.
Other dynamic information, like session info, is only stored in memory structures (similar to C arrays) and Oracle can query these as if they were tables.
So no, the data was not in the buffer cache. It was already in system memory.

Consistent gets/physical reads issue

Dear all,
There are not any of DML on table tb_hxl_user.
First Select:
SQL> select count(1) from tb_hxl_user;
COUNT(1)
286435658
Elapsed: 00:04:03.67
Statistics
        357 recursive calls
          0 db block gets
    2106478 consistent gets
    2106316 physical reads
          0 redo size
        422 bytes sent via SQL*Net to client
        416 bytes received via SQL*Net from client
          2 SQL*Net roundtrips to/from client
          6 sorts (memory)
          0 sorts (disk)
          1 rows processed                                                     Second Select:
SQL> select count(1) from tb_hxl_user;
COUNT(1)
286435658
Elapsed: 00:03:02.29
Statistics
          0 recursive calls
          0 db block gets
    2106395 consistent gets
    2106273 physical reads
          0 redo size
        422 bytes sent via SQL*Net to client
        416 bytes received via SQL*Net from client
          2 SQL*Net roundtrips to/from client
          0 sorts (memory)
          0 sorts (disk)
          1 rows processed                                                     After the first,I know that all the blocks have been flushed to SGA,
but the second select,it generated many " 2106395 consistent gets" and " 2106273 physical reads" also,
why?

What exactly is consistent gets read below link:
http://jonathanlewis.wordpress.com/2009/06/12/consistent-gets-2/
Which is similar to docs clearity and authenticity.
What exactly is physical read read below link:
http://download.oracle.com/docs/cd/B16240_01/doc/doc.102/e16282/oracle_database_help/oracle_database_instance_throughput_physreads_ps.html
Regards
Girish Sharma

AMI BIOS 2.2 Memory Settings

Maybe it's just me, but I can't get the memory settings in the AMI BIOS 2.2 (MSI K8T-Neo FIS2R) to do anything. Changes make no difference and the memory just runs at its SPD information every time (I'm using sandra to make this determination). I've run memtest 86+ on this memory at lower settings (3-3-3-6-1T) with no problems. In addition, A64 tweaker shows memory values as reserved values, so I can't tweak with it either.
The system is perfectly stable (it should be, given that it's running at the most conservative settings possible).
RAM is in slots 1&2 so it's not a DDR333/DDR400 1T/2T Athlon64 limitation. I have an Abit Kv8-max3 that runs this memory fine at 2.5-3-3-6-1T. (Hate to say it, but Phoenix's award core is MUCH more feature rich than these AMI BIOSes)
I didn't have this problem with the previous BIOS, but I'm a believer in running the latest, greatest BIOS. This statement is based on the 7 years I spent in x86 BIOS development at Compaq and Dell (while sempron D0 fix is all that's listed, I'd bet there's other subtle bugs resolved in the latest BIOS). Push comes to shove and I'll just reflash the 2.1 or 2.0 BIOS, but I can't imagine that MSI would have just broken this in a recent BIOS release.

There are a lot or reports on this Bios being broken. Just do a search for 2.2 Bios and see what is up.

Shared memory (System V-style) - High usage of phys memory and page outs

Hi!
I get a much higher usage of physical memory when I use shared memory than I would expect. Please, I would really need someone to confirm my conclusions, so that I can revise my ignorance in this subject.
In my experiments I create a shared memory segment of 200 MB and I have 7 processes attaching to it. I have a ws of 1 GB.
I expect to see what I see when I attach to the shared memory segment in terms of virtual size, i.e. SIZE in prstat. After attaching (mapping it) to the process all 7 processes are about ~203 MB each and this makes sense. RSS, in prstat, is about 3 MB for each process and this is ok to me too.
It is what I see when each of the 7 processes start to write a simple string like 'Hello!' in parallel to each page in their shared memory segment that I get surprised. I run out of memory on my ws after a while and the system starts to wildly page out physical memory to disk so that the next 'Hello!' can be written to the next page in the shared memory segment. It seems that each page written to in the shared memory chunk is mapped into each process private address space. This means that the shared memory is not physically shared, just virtually shared. Is this correct?
Can memory be physically shared, so that my 7 processes only use 200 MB? ISM? DISM?
I create a shared memory segment in a C-program with the following calls:
shmid = shmget(key, SHM_SIZE, 0644 | IPC_CREAT)
data = shmat(shmid, (void *)0, 0);Thanks in advance
/Sune

Your problem seemed reasonable. What were you doing wrong?
Darren

Virtex6:Configuration data download to FPGA was not successful. DONE did not go high, please check your configuration setup and mode settings

Hello，everyone.
I am using virtex6 FPGA and trying to download mcs file to PROM and have failed.
I download .bit file to FPGA and succeed.
When i try to download .mcs file to PROM XCF128X-FTG64C(BPI Flash) and choose Slave SelectMAP Mode
and the process is about 68% it fails.
The message below the IMapct is as belows:
done.
PROGRESS_END - End Operation.
Elapsed time =      0 sec.
// *** BATCH CMD : identifyMPM
// *** BATCH CMD : assignFile -p 1 -file "C:/Users/Administrator/Desktop/TEST/LED/led.bit"
'1': Loading file 'C:/Users/Administrator/Desktop/TEST/LED/led.bit' ...
done.
INFO:iMPACT:2257 - Startup Clock has been changed to 'JtagClk' in the bitstream stored in memory,
but the original bitstream file remains unchanged.
UserID read from the bitstream file = 0xFFFFFFFF.
INFO:iMPACT:501 - '1': Added Device xc6vlx240t successfully.
INFO:iMPACT - Current time: 2014/3/13 8:48:14
// *** BATCH CMD : Program -p 1
PROGRESS_START - Starting Operation.
Maximum TCK operating frequency for this device chain: 66000000.
Validating chain...
Boundary-scan chain validated successfully.
INFO:iMPACT - 1: Over-temperature condition detected! [ 230.52C > 120.00C]
1: Device Temperature: Current Reading: 230.52 C, Max. Reading: 230.52 C
1: VCCINT Supply: Current Reading:   2.997 V, Max. Reading:   2.997 V
1: VCCAUX Supply: Current Reading:   2.997 V, Max. Reading:   2.997 V
'1': Programming device...
Match_cycle = NoWait.
Match cycle: NoWait
LCK_cycle = NoWait.
LCK cycle: NoWait
done.
INFO:iMPACT:2219 - Status register values:
INFO:iMPACT - 0011 1111 0111 1110 0100 1011 1100 0000
INFO:iMPACT:579 - '1': Completed downloading bit file to device.
INFO:iMPACT:188 - '1': Programming completed successfully.
Match_cycle = NoWait.
Match cycle: NoWait
LCK_cycle = NoWait.
LCK cycle: NoWait
INFO:iMPACT - '1': Checking done pin....done.
'1': Programmed successfully.
PROGRESS_END - End Operation.
Elapsed time =     23 sec.
Selected part: XCF128X
// *** BATCH CMD : attachflash -position 1 -bpi "XCF128X"
// *** BATCH CMD : assignfiletoattachedflash -position 1 -file "C:/Users/Administrator/Desktop/TEST/LED/leda.mcs"
INFO:iMPACT - Current time: 2014/3/13 8:49:32
// *** BATCH CMD : Program -p 1 -dataWidth 16 -rs1 NONE -rs0 NONE -bpionly -e -v -loadfpga
PROGRESS_START - Starting Operation.
Maximum TCK operating frequency for this device chain: 66000000.
Validating chain...
Boundary-scan chain validated successfully.
INFO:iMPACT - 1: Over-temperature condition detected! [ 230.52C > 120.00C]
1: Device Temperature: Current Reading: 230.52 C, Max. Reading: 230.52 C
1: VCCINT Supply: Current Reading:   2.997 V, Max. Reading:   2.997 V
1: VCCAUX Supply: Current Reading:   2.997 V, Max. Reading:   2.997 V
'1': BPI access core not detected. BPI access core will be downloaded to the device to enable operations.
INFO:iMPACT - Downloading core file D:/Xilinx/14.3/ISE_DS/ISE/virtex6/data/xc6vlx240t_jbpi.cor.
'1': Downloading core...
Match_cycle = NoWait.
Match cycle: NoWait
LCK_cycle = NoWait.
LCK cycle: NoWait
done.
INFO:iMPACT:2219 - Status register values:
INFO:iMPACT - 0011 1111 0111 1110 0100 1011 1100 0000
INFO:iMPACT:2492 - '1': Completed downloading core to device.
Current cable speed is set to 6.000 Mhz.
Cable speed is default to 3Mhz or lower for BPI operations.
Current cable speed is set to 3.000 Mhz.
Setting Flash Control Pins ...
Setting Configuration Register ...
Populating BPI common flash interface ...
Common Flash Interface Information Query completed successfully.
INFO:iMPACT - Common Flash Interface Information from Device:
INFO:iMPACT - Verification string: 51 52 59
INFO:iMPACT - Manufacturer ID:        49
INFO:iMPACT - Vendor ID:             01
INFO:iMPACT - Device Code:           18
Setting Flash Control Pins ...
Using x16 mode ...
Setting Flash Control Pins ...
Setting Configuration Register ...
'1': Erasing device...
'1': Start address = 0x00000000, End address = 0x008CE03B.
done.
'1': Erasure completed successfully.
Setting Flash Control Pins ...
Using x16 mode ...
Setting Flash Control Pins ...
Setting Configuration Register ...
INFO:iMPACT - Using Word Programming.
'1': Programming Flash.
done.
Setting Flash Control Pins ...
'1': Flash Programming completed successfully.
Using x16 mode ...
Setting Flash Control Pins ...
Setting Configuration Register ...
'1': Reading device contents...
done.
'1': Verification completed.
Setting Flash Control Pins ...
Current cable speed is resumed to 6.000 Mhz.
'1': Configuration data download to FPGA was not successful. DONE did not go high, please check your configuration setup and mode settings.
`Elapsed time =    814 sec.
and i find many people have met the same thing. But they are spartan series FPGA and i try to low the Resistances of Mode pins,M0 M1 and M2, but the problem does not been solved.
I have read the status Registers and find there is an over-temperature state
and in Impact i could not readback the registers. It is strange.
I am anxious about this problem and have not solved it yet
What reasons may it be?
Hope for your answer, thank you

Hi~I want to know if you solve the configuration problem for virtex-6?
As I encounter the  same configuration problem, I want to consult  you with some question.
Can I have your email?
gszakacs wrote:
I have measured the VCCINT and find it is 1.0V, not 2.997V;
That is not at all surprising. I always assumed the problem is with reading the XADC (system monitor) block and not with the voltage or temperature.
my Reference board is ML605
That would have been nice to know at the beginning...
It seems that you have selected the correct mode, assuming your jumpers are set as required in the ML605 Hardware User's Guide. See table 1-27, table 1-33 and the note below it about switch S1.
I'm not that familiar with the details of this reference design, but it may be that the slave SelectMap circuitry requires a reset or power cycle to actually configure the FPGA. Have you tried power-cycling to see if the FPGA boots from the flash?
I'd also suggest that you select the V6 in the JTAG chain view, then go to the debug menu of Impact and select Read Device Status (this is from memory, but it's something like that). That will not only show the bits of the configuration status register, but also describe what each bit means. Among other things you can check the state of the FPGA's configuration logic and the Mode pins.

Firefox 4.0.1 is using 130 - 160mb of memory on Win7 and I'm getting a memory low error. Is there a memory leak on Firefox

I start getting a memory low warning in Windows 7 and the task manager shows Firefox as 130mb peaking at 160mb. Surely this is much too high and I wondered if there was a creeping memory leak going on. I've disabled most add-ons

Sorry didn't noticed it was solved.

High Consistent Gets and memory settings

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