03-19-2014
May be your team did not performed a stress test thoroughly, you will put the system to its max limits during that test (before you go live).
I guess, the no of users after go-live crossed the actual stress test, you guys under sized the system.
If you say NO and your answer is you did the stress test pushing to max, then my immediate guess is there might be change in code in application, ask them. Why there was no problem before and then sudden spike.
To the best of my experience either one of those should be it.
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LEARN ABOUT DEBIAN
stress
STRESS(1) User Commands STRESS(1)
NAME
stress - tool to impose load on and stress test systems
SYNOPSIS
stress [OPTION [ARG]] ...
DESCRIPTION
`stress' imposes certain types of compute stress on your system
-?, --help
show this help statement
--version
show version statement
-v, --verbose
be verbose
-q, --quiet
be quiet
-n, --dry-run
show what would have been done
-t, --timeout N
timeout after N seconds
--backoff N
wait factor of N microseconds before work starts
-c, --cpu N
spawn N workers spinning on sqrt()
-i, --io N
spawn N workers spinning on sync()
-m, --vm N
spawn N workers spinning on malloc()/free()
--vm-bytes B
malloc B bytes per vm worker (default is 256MB)
--vm-stride B
touch a byte every B bytes (default is 4096)
--vm-hang N
sleep N secs before free (default is none, 0 is inf)
--vm-keep
redirty memory instead of freeing and reallocating
-d, --hdd N
spawn N workers spinning on write()/unlink()
--hdd-bytes B
write B bytes per hdd worker (default is 1GB)
--hdd-noclean
do not unlink files created by hdd workers
Example: stress --cpu 8 --io 4 --vm 2 --vm-bytes 128M --timeout 10s
Note: Numbers may be suffixed with s,m,h,d,y (time) or B,K,M,G (size).
SEE ALSO
The full documentation for stress is maintained as a Texinfo manual. If the info and stress programs are properly installed at your site,
the command
info stress
should give you access to the complete manual.
stress 1.0.1 August 2009 STRESS(1)