Out of Memory: ResultSet.getBytes accounts for 24,000 allocations of byte[]
Hi,
We are using Weblogic6.0 deployed on Win NT
There is a query in one of our classes which returns the Catalog Items from the
d/b. We have 2000 Catalog Items in the database. When w144 users concurrently
try to retrieve this data we run out of memory.
We used Jprobe for profiling this, the maximum memory is being consumed by the
byte[] (64,766,540 Bytes, 40,570 allocations) ,it is consuming 80% of memory.
The maximum allocations(24,552 allocations) are being made at TdsEntry.getBytes
(which actually is from ResultSet.getBytes).
I am very curious as to why so many byte[] are being allocated which are not being
released.
(Our each Catalog Item has size of 100 bytes , so 100*14*2000 = 2800kB which is
approx 2.8 MB)
Any help is appreciated
Thanks and Regards
Rashmi
Hi. I am sure we will look into whether there is anymemory wastage in our
driver. You should repeat the test using someone else's driver too. This
application seems to be crying out for a better way. Unless the catalog
is changing by the instant, it would be much more efficient to have
a serverside class that occasionally went to the DBMS and got the latest
contents of the catalog, and have all your user classes go to this class
to share the one in-memory copy.
Joe Weinstein at B.E.A.
Rashmi S wrote:
Hi,
We are using Weblogic6.0 deployed on Win NT
There is a query in one of our classes which returns the Catalog Items from the
d/b. We have 2000 Catalog Items in the database. When w144 users concurrently
try to retrieve this data we run out of memory.
We used Jprobe for profiling this, the maximum memory is being consumed by the
byte[] (64,766,540 Bytes, 40,570 allocations) ,it is consuming 80% of memory.
The maximum allocations(24,552 allocations) are being made at TdsEntry.getBytes
(which actually is from ResultSet.getBytes).
I am very curious as to why so many byte[] are being allocated which are not being
released.
(Our each Catalog Item has size of 100 bytes , so 100*14*2000 = 2800kB which is
approx 2.8 MB)
Any help is appreciated
Thanks and Regards
Rashmi
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I'm evaluating jrockit and trying to run in ita java application that I normally
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I also use many native methods in different libraries.
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SibeliusHello Staffan,
Thanks for the info. I had v1.4.1_05 and I have now installed v1.4.2_03.
Unfortunately, the error still happened at the same point in the code, although
much earlier on, but this time no message was displayed. It was just stuck there.
However, I changed the code a little bit (I put the catch block in another private
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So, can you tell why this code won't works?
public void checkRead(String fileName, Object context) {
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But if I write it like following, it works!
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Sibelius
Staffan Larsen <[email protected]> wrote:
You didn't mention which version of JRockit this happens with (java
-version). I would suggest you upgrade to JRockit 1.4.2 if you haven't
already.
Regards,
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Sibelius Segala wrote:
Hello,
I'm evaluating jrockit and trying to run in ita java application thatI normally
run with the Sun JVM on WinXP.
After a few seconds I get the message "Out-of-memory condition? : waitingfor
an available stack".
I'm running it on an Intel machine, WindowsXP 392Mb RAM.
I have played with different GC options, heap, stack size, native/thinthreads
but it always stops around the same point. When I turn -Xverbose:codegenon I
can see that it's trying to compile a method in my own security manager.The message
is something like that:
[codegen] 500 84732 5169 de.irt.mhp.security.MySecurityManager.checkRead(Ljava.lang.String;Ljava.lang.Object;)V:
7583.59 ms
[codegen] 500 84732 5170 de.irt.mhp.security.MySecurityManager.checkRead(Ljava.lang.String;Ljava.lang.Object;)V:
7583.59 ms
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7583.59 ms
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It looks as though it's in a loop.
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public void checkRead(String fileName, Object context) {
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if(context==null) {
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MAC/DAC possibilities
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FileSystem filesys=(sdi==null)?null:sdi.getFileSystem();
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