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| Solaris The Solaris Operating System, usually known simply as Solaris, is a Unix-based operating system introduced by Sun Microsystems. The Solaris OS is now owned by Oracle. |
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#1
03-27-2009
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Page cache too large
I have a solaris10 box running a java application on it. Whenever the java app is used heavily, the amount of free memory decreases fairly rapidly. I believe I have eliminated the running applications from the culprit list. In the process I have found that the page cache is consuming about 20G of the 24G of memory on the box. I read in other posts that this is okay, since the cache is easily dumped when required by applications. But after the box reaches around 1% free memory, swap starts filling up. This makes monitoring the amount of free memory and swap pretty much useless. Any ideas on how to identify what is getting cached, and/or how to keep it down to something sensible ? Code:
echo "::memstat"|mdb -k Page Summary Pages MB %Tot ------------ ---------------- ---------------- ---- Kernel 208042 1625 7% Anon 200571 1566 6% Exec and libs 2644 20 0% Page cache 2452919 19163 79% Free (cachelist) 111729 872 4% Free (freelist) 138338 1080 4% Total 3114243 24330 Physical 3059418 23901 Code:
last pid: 6927; load avg: 0.44, 0.56, 0.56; up 204+14:35:29 13:55:18
74 processes: 72 sleeping, 2 on cpu
CPU states: 90.1% idle, 6.9% user, 2.9% kernel, 0.0% iowait, 0.0% swap
Memory: 24G phys mem, 1539M free mem, 24G total swap, 21G free swap
PID USERNAME LWP PRI NICE SIZE RES STATE TIME CPU COMMAND
9529 root 33 59 0 1094M 586M sleep 18:06 0.02% java
12190 root 68 44 0 505M 472M cpu/3 72.9H 8.02% java
551 daemon 4 59 0 389M 333M sleep 5:18 0.00% nfsmapid
2935 noaccess 27 59 0 220M 56M sleep 180:44 0.01% java
19134 named 7 59 0 44M 18M sleep 29:57 0.01% named
789 root 16 59 0 14M 2640K sleep 2:32 0.00% fmd
7 root 13 59 0 12M 4056K sleep 2:50 0.00% svc.startd
26079 root 1 59 0 11M 4976K sleep 0:00 0.00% sshd |
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#2
03-27-2009
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Could it be a memory leak in either the Java app or in Java itself?
How to Fix Memory Leaks in Java | Javalobby Handling memory leaks in Java programs |
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#3
03-27-2009
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If the java app was leaking memory, wouldn't it's memory usage grow over time ?
Also, killing and restarting the application does not clear the memory, I have to reboot the box to free up the memory. In the meantime, during a maintenance window I will take a heap dump and try to start debugging it. Thanks for the tips! -- Tim |
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#4
03-27-2009
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The issue isn't related to your java application leaking heap memory.
What I suspect is the java application creating huge files that would stay the /tmp directory. The "Page cache" is reporting tmpfs usage, beyond other things. What says: "df -k /tmp" ? |
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DustinT (3 Weeks Ago) | ||
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#5
03-28-2009
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Wow, you sliced that with occam's razor for sure!
It was a stupid file that was being logged to in /tmp/. Which of course, was cleared out on a reboot. Thanks so much. -- Tim |
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| memory, page cache, solaris 10 |
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