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Operating Systems Linux Ubuntu High System CPU Usage
# 1  
Old 10-15-2010
High System CPU Usage
I am running a Dell PE R815 with 4 x AMD 12 core CPUs with 128GB of RAM and a RAID 5 array of 6 SAS disks. This is an HPC application and is definitely CPU bound, however once I run 16 of these processes (thus pinning 16 cores) the work performed slows down dramatically, to maybe 5 or 10% of what it normally is capable of. Top shows that all HPC processes are using 100% CPU but they rather dramatically shift to system usage (rather than user). Here is a vmstat output:
Quote:
$ vmstat -S M 1 10
procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu----
r b swpd free buff cache si so bi bo in cs us sy id wa
46 0 0 64968 152 50747 0 0 3 41 0 0 11 32 57 0
46 0 0 64967 152 50747 0 0 0 15860 5255 127 6 89 4 0
46 0 0 64967 152 50747 0 0 0 0 5159 104 7 89 4 0
46 0 0 64968 152 50747 0 0 0 0 5153 106 7 89 4 0
46 0 0 64968 152 50747 0 0 0 40 5232 188 7 89 4 0
46 0 0 64968 152 50747 0 0 0 0 5014 102 7 90 3 0
46 0 0 64968 152 50747 0 0 0 4860 4896 107 7 88 5 0
46 0 0 64968 152 50747 0 0 0 0 5125 103 7 90 3 0
46 0 0 64968 152 50747 0 0 0 0 4987 104 7 89 4 0
46 0 0 64968 152 50747 0 0 0 2520 4805 184 7 89 4 0
To me it doesn't look like a RAM or Disk issue, but perhaps an IO or buffering issue. Please help!

-mowmentous
# 2  
Old 10-15-2010
Does this application use a database? If so, which one?

Is it a web application? Network application?
# 3  
Old 10-15-2010
Quote:
Originally Posted by Neo
Does this application use a database? If so, which one?

Is it a web application? Network application?
No it is purely file based and does not use any network resources. It just crunches large sets of numbers.

-mowmentous
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