Does RHEL or Linux in general limit the amount of memory being used by a
single process? If so, how do I get around this? After an application
performing a lot of small mallocs (160 bytes each) nears about 1 GB
worth of allocated memory, RHEL seems to be slowing down the allocation
speed of the application. In the first maybe 5 million mallocs it can do
about 100,000 mallocs per second, however after more than 1 GB worth it
slows down to just a few thousand per second. CPU consumption also
slowed down from ~12% (1 CPU full load) to just about 1-3%.
Is there something I can do on Linux or RHEL, or maybe something else I
should do in my coding? Some stats...
16:14:57 up 13 days, 4:56, 1 user, load average: 1.00, 1.08, 0.99
169 processes: 168 sleeping, 1 running, 0 zombie, 0 stopped
CPU states: cpu user nice system irq softirq iowait idle
total 0.4% 0.0% 0.2% 0.0% 0.0% 12.1% 87.0%
cpu00 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 100.0%
cpu01 0.9% 0.0% 0.0% 0.0% 0.0% 0.0% 99.0%
cpu02 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 100.0%
cpu03 0.0% 0.0% 1.9% 0.0% 0.0% 0.0% 98.0%
cpu04 2.9% 0.0% 0.0% 0.0% 0.0% 97.0% 0.0%
cpu05 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 100.0%
cpu06 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 100.0%
cpu07 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 100.0%
Mem: 9879976k av, 2391196k used, 7488780k free, 0k shrd, 35592k
buff
2009064k actv, 134928k in_d, 83160k in_c
Swap: 2044072k av, 1022036k used, 1022036k free 246204k
cached
PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM TIME CPU COMMAND
16343 root 15 0 1942M 1.8G 348 D 0.3 19.6 5:51 4 tcluster
19 root 15 0 0 0 0 SW 0.2 0.0 0:35 3 kswapd
Thanks in advance,
Carlo
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