Time in Microsecond

Hello Friends,
Is it possible to get time in micro second in Java? If yes, can anyone tell how? My email is [email protected]
Thanks in advance,
gaurang.

i think there is no chance to do it, cos java is to slow for this. if a microsecond is over, the javainterpeter is just not at the end of the line, where you want to get microsecond
regards

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How can I get the time in Microsecond with JNI ?

How can I get the time in Microsecond with JNI ?

JNIEXPORT jdouble JNICALL Java_Win32Native_queryPerformanceFrequency (JNIEnv *env, jobject obj) {
     LARGE_INTEGER lFrequency;
     ::QueryPerformanceFrequency(&lFrequency);
     return (jdouble)lFrequency.QuadPart;
JNIEXPORT jdouble JNICALL Java_Win32Native_queryPerformanceCounter (JNIEnv *env, jobject obj) {
     LARGE_INTEGER lpCounter;
     ::QueryPerformanceCounter(&lpCounter);
     return (jdouble)lpCounter.QuadPart;

Current time in microseconds

For one of my programs i want to find the current time in microseconds. How do i get this in Java?

The server makes the OS calls that hook into the system processor cycle count,....
Java doesn't directly provide this functionality.Which brings up an interesting question/point (I think).
Since Java provides an sql.TimeStamp class to map to an sql database supporting nanos, how does Java instantiate this class as far as nanos are concerned? Unless the only thing its good for is for READING sql TIMESTAMP values.
My understanding of this is important as it can impact my db design. I would rather have my ejb's create this data in the j2ee server, when doing sql INSERT's, rather than having the db itself do the TIMESTAMP with a trigger (for a variety of reasons, including cache maintenance). But if the nanos are all zero(!)...well, need to use a trigger.
Thanks
-nat

Getting time in microseconds

With the class java.lang.System you can have time in milli seconds via the function getTimeMillis().
I should be very helpfull to have another function like this getTimeMicros() that returns time in microseconds.
Because in some tests I made I did not have enough precision with time in milliseconds. So I hope for the JDK 1.5.1 this function will be created.
Thanks a lot.

I was requesting precision in microseconds but I was
not expecting to have it in nanos ! It's wonderlfull
It could not be more precise anymore !Well, this makes sense only if the underlying OS
supports it. Don't expect nanosecond accuracy unless
you actually test it on the platform you're going to
run it on.Moreover it might not be 1 nano either. Just as millis are not necessarily 1 milli.

Retrieve Computer time in microsecond

to retrieve computer time i use the function System.currentTimeMillis() but i need the time in microsecond. how could i get that?

<snip>
Java 1.5 added nanosecond methods for hardware/OS
combinations that can support it.Which at current includes none at all :)<snip>
Are you saying that System.nanoTime() isn't supported at the present time?
That's not correct - I am running a 3 GB Pentium 4, a relatively recent GigaByte m/b and XP Pro, and get very good microsecond and submicrosecond results from the method.
I executed 2 consecutuive calls to the method, like so
startTime = System.nanoTime();
estimatedTime = System.nanoTime() - startTime;and averaged 100 repetitions.
Results vary with the manner in which the jvm is executed. Here's a summary of results, to give a feel for what's possible.
Program Execution From        Nanoseconds (average)
Commandline                     1300
CrimsonEditor                    500
jEdit                            700
NetBeans IDE 4.1                1050So, depending on the method of execution, nanosecond precision ranges from 500 to 1300 (0.5 microsecond to 1.3 microsecond). Accuracy (repeatability) is not as good - there are outliers in the individual times, probably due to Garbage Collections. However excluding those outliers, times appear reasonably repeatable.

Execution time in microseconds

Hi,
Can someone tell me what should be the ideal execution time of a program in microseconds. My program consists of 2586 lines and has almost around 10 subroutines and some 10 function modules. Could you suggest me how the execution time is determined for a program.
Thanks,
Binay.

You can use simple command like
declare three variables :
data : a Type i,
b type i,
c type i.
start-of-selection.
Write the command in staring
get runtime field a. -> will have intial start time
write the one more command in last
get runtime field b. -> this is final time
c = b - a. -> c will have total execution time in micro seconds
or
you can use ST05 Transaction to find out the time,here you need count the all times.
Thanks
Seshu

Get time in microseconds

i want to time algorithms and would like to time them in microseconds.
I don't know how do that.
thanks

i want to time algorithms and would like to time them
in microseconds.
I don't know how do that.
thanksJava doesn't provide that kind of time-resolution. Your best bet is to run each algoritm many times in a loop so the total time becomes seconds. Then you divide by the number of repeats and get the average time for your algoritm -:)
This has another advantage. The optimizations done by the Java runtime system may take some runs to kick in and by repeating the algoritms many times the "warm up" time will be averaged out.
But be careful if your algoritms allocate many objects on the stack so you aren't actually measuring the garbage collectors performance.

Time in microseconds

Can someone tell me how can I get the current time to the microsecond level. If I use sy-uzeit, it provides only till the seconds level.
Thanks..
Swetha.

hi,
5555178 Microseconds = 5.555178 Seconds
so
Microseconds = ( 5.555178 / 5555178 ) Seconds
so convert hours, minutes to seconds and then convert seconds to micro seconds .....
Regards,
Santosh

System time in microseconds

The static method System.currentTimeMillis() give us the system time in milliseconds. Is there any method that can give us the system time with a microscond resolution ?
Thanks for your attention.
Bruno.

The system time is not even accurate in milliseconds on many operating systems. In Windows, I think it is only accurate to 50 milliseconds.

Response time of a function module

Hi Friends,
    I'm creating a cutom program where i was using a BAPI ,which exist in other server.
   Now i want to record the response time of the BAPI , after placing the request in it and display the Time for the
   corresponding record in output.
Is there any procedure to record the response time in the program / I'm not asking the transactions where we can
measure the performances.
Moderator message - please do not ask for or promise rewards.
Thanks & Warm Regards
Krishna
Edited by: Rob Burbank on Oct 1, 2009 8:50 AM

Hello,
The correct method, as pointed out in previous posts, is with GET RUN TIME. Note that this returns time in microseconds, so you may want to scale this up to a larger unit.
As to the usefulness: it is perfectly legitimate to include time measurements in your program as long as this has a clear purpose, e.g. comparing response times between different remote systems, identifying erratic response times, etc. In that case I would advise you to also include some other measurement, e.g. the amount of data processed (whether you can do this and how depends on the BAPI, e.g. you could use the number of lines in the returned internal tables as a metric). If your time measurement creates separate log/trace records, then it would also be a good idea to have the option to enable and disable the time measurement.
Regards,
Mark

Time Machine stuck in a new and different way

Time Machine is stuck in a new way. "dtruss -e -p <pid>" shows it in a loop doing nothing but this:
   1032 __semwait_signal(0xC03, 0x0, 0x1)
= -1 Err#60
   1143 __semwait_signal(0xC03, 0x0, 0x1)
= -1 Err#60
   1155 __semwait_signal(0xC03, 0x0, 0x1)
= -1 Err#60
   1146 __semwait_signal(0xC03, 0x0, 0x1)
= -1 Err#60
   1153 __semwait_signal(0xC03, 0x0, 0x1)
= -1 Err#60
   1152 __semwait_signal(0xC03, 0x0, 0x1)
= -1 Err#60
   1138 __semwait_signal(0xC03, 0x0, 0x1)
= -1 Err#60
   1146 __semwait_signal(0xC03, 0x0, 0x1)
= -1 Err#60
   1155 __semwait_signal(0xC03, 0x0, 0x1)
= -1 Err#60
(The numbers are the elapsed times in microseconds. Err#60 is ETIMEDOUT.)
Repeated use of lsof shows that backupd has no regular files open except its log file, which ends with
+----
Processing preflight info
    Space needed for this backup: 3.83 GB (933889 blocks of size 4096)
    Preserving last snapshot /Volumes/Loki TM/Backups.backupdb/loki/2013-04-18-073658
Finished processing preflight info
Copying items from "Loki HD" (mount: '/' fsUUID: 9E4DC7A0-9DDE-3A37-827F-3BB94B19F396 eventDBUUID: AD43DC6A-C748-44F2-8A1B-494E472E3214)
+----
I killed it, trashed the .inProgress backup, and started it up again and it has been like this for two more days.
The backupd disk is a partition on a local firewire drive. Backups had been proceeding normally for a couple of months at least.
Any ideas?

If you have more than one user account, these instructions must be carried out as an administrator.
Launch the Console application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Console in the icon grid.
Make sure the title of the Console window is All Messages. If it isn't, select All Messages from the SYSTEM LOG QUERIES menu on the left. If you don't see that menu, select
View ▹ Show Log List
from the menu bar.
Enter the word "Starting" (without the quotes) in the String Matching text field. You should now see log messages with the words "Starting * backup," where * represents any of the words "automatic," "manual," or "standard." Note the timestamp of the last such message. Clear the text field and scroll back in the log to that time. Select the messages timestamped from then until the end of the backup, or the end of the log if that's not clear. Copy them (command-C) to the Clipboard. Paste (command-V) into a reply to this message.
If there are runs of repeated messages, post only one example of each. Don't post many repetitions of the same message.
When posting a log extract, be selective. Don't post more than is requested.
Please do not indiscriminately dump thousands of lines from the log into this discussion.
Some personal information, such as the names of your files, may be included — anonymize before posting.

How to search for value records for a specific period of time?

Hi,
I am building an application where I need to use BDB to store tons of call records.
In the call records, I have the following fields:
1. from-caller
2. to-caller
3. begin-time
4. end-time
5. account-code
6. user-code
I want to use end-time's microsecond representation to serve as the Key.
So, how can I do the following data lookup?
1. Search for all Value records between 2009-10-11 to now()
2. Search for all Value records between 2009-10-11 to now() with account-code = 100
3. Search for all Value records between 2009-10-11 to now() with account-code = 100 and user-code=10
Is there any similar examples out there that I can refer to?
Thanks,
JB

Hi,
Btw, my operation is mostly:
1. Append call records
2. Search call records
3. Remove ending records that are older than XX days
Please kindly advise on how I should best structure the data to meet this purpose.
Thanks,
JB

Identifying query execution time

Hello,
I would like to know how can I figure out the actual query execution time in Oracle.
Regards

Oracle Documentation is your best friend.
http://download.oracle.com/docs/cd/B19306_01/server.102/b14237/dynviews_2113.htm#i1417057
ELAPSED_TIME --> Elapsed time (in microseconds) used by this cursor for parsing, executing, and fetching
Asif Momen
http://momendba.blogspot.com

Time of execution of SQL statement

Hi,
I executed some DML statements and Select statements as user SYS for user U1. How can I find the time of execution of these statements?
Regards,
Mathew

You have a couple of options to time queries.
SET TIMING ON has already been mentioned. I'll add that spooling the session to a file helps keep those timings for later reference.
You can use DBMS_UTILITY.GET_TIME to get start and end times in microseconds for PL/SQL evaluation. DBMS_PROFILER will time lines of PL/SQL code as they execute. Trace/tkprof has also already been mentioned, although tkrpof times tend to vary a bit between reported and real times and don't take OS activity into account as much as the other timings do.

Timer in microsec

Hi:
Does anyone know how to measure time in microseconds? The only class I know of is "System" with its method "currentTimeMillis", which give time difference in milliseconds. I need to time a code which runs in less than milliseconds.
Thanks Guys!

>
What are you talking about?!?! 18Hz clock?
The CPU clock runs at gigahertz these days.I know ;)
The
"system clock" is generated by timer interrupts. The
"standard" 10 ms clock is generated because that was a
convention back in the eighties with Unix (which DOS
adopted). Most OSes now have either a 60Hz (16.66 ms
per interval) or 100Hz (10ms per interval) "clock"
granularity.
I've just said that on a Windows 98 PC I observed
that the result of System.currentTimeMillis() was
updated only in alternating 50 and 60 ms steps.
You just should be prepared. Thank you for your
numbers of 10 and 17 ms. They might be useful
for me in the future to explain something.
But those 10 and 17 ms are no more that 5
times finer than 55 ms, of course ;).
However, most OSes are also capable of generating
finer-grained clocks. Windows NT and XP can
programmatically generate a 1 ms clock timer. So can
POSIXy (Linux, Unix, etc.) systems (though
administratve privileges are usually needed because
this is a system-wide change).
Smaller granularities are theoretically possible, but
at a terrible price in system performance (the kernel
would be spending most of its time handling clock
interrupts).
The Thread.sleep() provides very fine granularity. It
really provides ms wait intervals (even on that
Windows 98 PC that I mentioned).
;) By the way, there even was a bug with the Thread.sleep() fuction:
http://developer.java.sun.com/developer/bugParade/bugs/4500388.html

Time in Microsecond

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