# VIRT memory jumps by 64M

**URL:** <https://forums.suse.com/t/virt-memory-jumps-by-64m/21604>\
**Category:** SLES Install-Boot\
**Created:** [August 31, 2011, 6:26pm UTC](https://forums.suse.com/t/virt-memory-jumps-by-64m/21604 "2011-08-31T18:26:02Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![System1](https://avatars.discourse-cdn.com/v4/letter/s/51bf81/32.png) [@System1](https://forums.suse.com/u/System1)\
**Post date:** [August 31, 2011, 6:26pm UTC](https://forums.suse.com/t/virt-memory-jumps-by-64m/21604/1 "2011-08-31T18:26:02Z")

</div>

Our application is moving from SLES10 SP2 to SLES11 SP1. When running  
stability test for 4 days, VIRT of some processes can jump 64M  
sometimes. But Res doesn’t change. I am not sure whether it is memory  
leak.  
When I check by pmap, I find that all of increased 64M are [anon]. I  
can confirm our application will not alloc 64M memory one time.

Pmap output when process is starting:

START SIZE RSS PSS DIRTY SWAP PERM MAPPING  
0000000000400000 2548K 1112K 1112K 0K 0K r-xp /opt/\*\*\*  
000000000087c000 84K 52K 52K 24K 0K r–p /opt/\*\*\*  
0000000000891000 304K 24K 24K 12K 0K rw-p /opt/\*\*\*  
00000000008dd000 908K 880K 880K 880K 0K rw-p [heap]  
00007f006196a000 4K 0K 0K 0K 0K —p [anon]  
00007f006196b000 8192K 12K 12K 12K 0K rwxp [anon]  
00007f006216b000 4K 0K 0K 0K 0K —p [anon]  
00007f006216c000 8192K 8K 8K 8K 0K rwxp [anon]  
00007f006296c000 4K 0K 0K 0K 0K —p [anon]  
00007f006296d000 8192K 8K 8K 8K 0K rwxp [anon]  
00007f006316d000 4K 0K 0K 0K 0K —p [anon]  
…

pmap output when process is running for some time:

START SIZE RSS PSS DIRTY SWAP PERM MAPPING  
0000000000400000 2548K 1112K 1112K 0K 0K r-xp /opt/\*\*\*  
000000000087c000 84K 52K 52K 24K 0K r–p /opt/\*\*\*  
0000000000891000 304K 24K 24K 12K 0K rw-p /opt/\*\*\*  
00000000008dd000 908K 880K 880K 880K 0K rw-p [heap]  
00007f0054000000 132K 24K 24K 24K 0K rw-p [anon]  
00007f0054021000 65404K 0K 0K 0K 0K —p [anon]  
00007f005c000000 132K 44K 44K 44K 0K rw-p [anon]  
00007f005c021000 65404K 0K 0K 0K 0K —p [anon]  
00007f006196a000 4K 0K 0K 0K 0K —p [anon]  
00007f006196b000 8192K 12K 12K 12K 0K rwxp [anon]  
00007f006216b000 4K 0K 0K 0K 0K —p [anon]  
00007f006216c000 8192K 8K 8K 8K 0K rwxp [anon]  
00007f006296c000 4K 0K 0K 0K 0K —p [anon]

It seems that some 65404 anonymous occurs

## – greencacti

greencacti’s Profile: [http://forums.novell.com/member.php?userid=116080](http://forums.novell.com/member.php?userid=116080)  
View this thread: [http://forums.novell.com/showthread.php?t=443980](http://forums.novell.com/showthread.php?t=443980)

---

<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/flex022/uploads/suse/original/2X/5/5012ba89e3ffb5220dac47d5ea0ba032e2fe1cb6.png) [@system](https://forums.suse.com/u/system)\
**Post date:** [September 6, 2011, 9:18pm UTC](https://forums.suse.com/t/virt-memory-jumps-by-64m/21604/2 "2011-09-06T21:18:55Z")

</div>

greencacti,

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