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Tuesday, July 7th, 2009

nohz=off is the Way to Go

Categories: [ IT ]

Debian Lenny's default kernel is tickless, meaning that there is no periodic tick anymore. As a result, it seems that some applications that use periodically short sleeps (as in while(1) { // do possibly something; usleep(250); }) are scheduled far too often and the CPU is running more than in should while the system is seemingly idle. Passing the option nohz=off to the kernel seems to have fixed that problem.

[ Posted on July 7th, 2009 at 18:34 | no comment | ]