wow.
make -j4 really was close to 4 times as fast on a kernel build.<3
Thursday, January 15, 2009
-j4
I've been aware of make's parallel building capabilities forever. I just never felt motivated to try them out (being usually on my ancient single-core laptop) Now that I'm on a quad-core box full time I figured it'd be worth a shot.
wow.
<3
wow.
<3
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You can probably get more agressive than that ... We've found that a value of roughly ${CORES}*2 or ${CORES}*2+1 works well for Firefox builds -- e.g., -j4 or -j5 on dual-core and -j8 on quad-core -- depending on what we're compiling. Not sure why this is, but I suspect that with two jobs per core, there's a lower occurrence of stalling waiting for disk (i.e., if one job on a core is stalled, the other probably isn't). Program type and cache size also seem to come into play, YMMV.
-Chris Tyler
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