-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Ethen,
On 7/30/15 6:52 AM, Ethen John wrote: > I have a linux server which is running 2 similar instances of > Tomcats 7. > > Each of the tomcat instances has the exact same web application > (.war) deployed. > > The application is not actively used by the users, but the behavior > of the application on both the tomcat instances is looking very > sluggish. What are you using as your performance metric? > I checked the memory utilization of the server machine, which is > as follows: > > top - 12:47:20 up 182 days, 43 min, 1 user, load average: 0.09, > 0.16, 0.15 Tasks: 226 total, 1 running, 225 sleeping, 0 stopped, 0 > zombie Cpu(s): 0.1%us, 0.2%sy, 0.0%ni, 99.7%id, 0.0%wa, 0.0%hi, > 0.0%si, 0.0%st Mem: 15529M total, 11474M used, 4054M free, 485M > buffers Swap: 16383M total, 0M used, 16383M free, 9633M cached So you have a system with 16GiB of RAM. 16GiB of swap seems like a lot. I think Java tries very hard not to get swapped-out (might prohibit the OS from doing it), so you may find that you never use all that. The machine looks completely idle to me. > PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 7866 root 0 > -20 43036 12m 2640 S 12 0.1 2479:02 scopeux 1 root 20 0 10548 824 > 692 S 0 0.0 1:41.80 init 2 root 20 0 0 0 0 S 0 0.0 0:00.16 > kthreadd 3 root 20 0 0 0 0 S 0 0.0 3:09.18 ksoftirqd/0 5 root 20 0 > 0 0 0 S 0 0.0 15:56.61 kworker/u:0 So... that's the useless part of the output. What about your JVM processes? > ========================= > > yyy@xxx:~> free -m total used free shared buffers cached Mem: 15529 > 11469 4059 0 485 9633 -/+ buffers/cache: 1350 14178 Swap: 16383 0 > 16383 Okay, nothing new here -- top included this already. > ====================== > > yyy@xxx:~> df -kh Filesystem Size Used Avail Use% Mounted on > /dev/mapper/vg00-rootvol 5.0G 1.4G 3.4G 29% / udev 7.6G 220K 7.6G > 1% /dev tmpfs 24G 0 24G 0% /dev/shm /dev/sda1 510M 48M 437M 10% > /boot /dev/mapper/vg00-homevol 992M 12M 929M 2% /home > /dev/mapper/vg00-tmpvol 2.0G 201M 1.7G 11% /tmp > /dev/mapper/vg00-varvol 7.9G 319M 7.2G 5% /var > /dev/mapper/vg00-crashvol 2.0G 68M 1.9G 4% /crashdump > /dev/mapper/vg00-auditvol 248M 11M 226M 5% /var/log/audit > /dev/mapper/vg00-optvol 12G 1.5G 9.8G 13% /opt > /dev/mapper/vg00-webdienste 99G 3.7G 95G 4% /webdienste The disk stats don't matter much. > Does the information above provide any pointers that can be > addressed further. Can you give us any information other than "I've got a server with a bunch of RAM and my application feels slow"? - From what you've shown us, there is no problem: the server is idle. > The strange thing is the used memory consumption of 11474M: Why is that strange? Memory exists to be used. Unused memory is a waste of silicon and power. What are the memory-related parameters for your JVMs? > Mem: 15529M total, 11474M used, 4054M free, 485M buffers > > I am also planning to have Lymbda probe installed on each of the > tomcat instances to get more details. Or you can just use "ps", but feel free to get heap-level information. > Afterwords, I am also planning to restart the server machine. That usually doesn't have a measurable effect on performance. > The application works fine on the other earlier version (5) of > Tomcat instance. It's just that we have now migrated the > application to Tomcat 7 with Java 6 and experiencing this > behavior. Glad to see you're all up-to-date for deployment in 2011. > The new server machine only running 2 tomcat 7 instances and > nothing else. It appears to be sitting idle. What's the problem? - -chris -----BEGIN PGP SIGNATURE----- Comment: GPGTools - http://gpgtools.org iQIcBAEBCAAGBQJVulA4AAoJEBzwKT+lPKRYFH4QAJZsWHe+vtgMWSXFub/QmkFx bggJNpcVxlDJrs3PBTjWTYuhuttsb++K1IUWeCE3Jc+W3YKwMAFYeSuHiOY0vVcT 95/b0sW9ePrbWWP4TFFx2xX52Bhnoc3Kij2jZuMvQBN/rtpD595J9NusssZcIu6I CR/mGxzpsU42cDtWyB7Q9WYm0dQnhq3qA6LN+GwYPUvR4IaTfCn+e0WLShbH+i/k qW0SIUIvFh7Rz/wnFa8BGRCmlpWp5QPbsnNsS7SF4cqU/riWXtj+f1vt521wNlpj xEUXn5f3kDsIVu1LFvNd0IvqpmWvRpdLbPH3D7EYJafo2sA3me3LyJRq+YfGZHVg tTRNG4TrlQ/oiXs1QDerSgehCYvpMkp4dK1NMD5kfei9vCYAJXQJfNc1Pqec5ko3 ETt22jg4oflwxP0kw2i2F+KgLjm1xqFgVxr8g/NODjRvEs+mglxYEchrm2loPSdT sU0xQE0ipvf+2S6M1MaimKFb2E7LqnbDSqU/UtNh0hRmUTrYBnbaXXfV1LUKs48Q BWinFrie+auNMohLHmpD3moVO8VWQaalJa9JthMfw4GoNKIi6FgZHMEc3pKhEZSI TMZLR1vxu1sur3DmmUaIZ9Jn/oHYMVpG6fsLXVbS9TseAjCbqptiOxOeHNvSk0kK OMvZKeLtD65uyw/sTSGV =JtMt -----END PGP SIGNATURE----- --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
