Intuitively, I would expect several CPUs hammering away at the compile to
finish faster than one. Given these numbers, I would have to conclude
that is not just wrong, but absolutely wrong. Compile time increases
linearly with the number of jobs, regardless of the number of CPUs.
What would cause this? Severe memory bottlenecks?
-- Brian
On Tuesday 08 January 2002 10:39 pm, Mike Kravetz wrote:
> --------------------------------------------------------------------
> mkbench - Time how long it takes to compile the kernel.
> We use 'make -j 8' and increase the number of makes run
> in parallel. Result is average build time in seconds.
> Lower is better.
> --------------------------------------------------------------------
> # CPUs # Makes Vanilla O(1) haMQ
> --------------------------------------------------------------------
> 2 1 188 192 184
> 2 2 366 372 362
> 2 4 730 742 600
> 2 6 1096 1112 853
> 4 1 102 101 95
> 4 2 196 198 186
> 4 4 384 386 374
> 4 6 576 579 487
> 8 1 58 57 58
> 8 2 109 108 105
> 8 4 209 213 186
> 8 6 309 312 280
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