Hexorg
Tux's lil' helper
Joined: 29 Oct 2009
Posts: 116
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 Posted: Sat Aug 04, 2012 5:31 pm Post subject: Kernel compilation and different -j# flags |
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Hey everyone, I was playing around with my kernel, and decided to find out how the -j flag would change compiling speed.
The machine I used is
Intel Core i7-3773k @ 3.5Mhz (4 cores, 8 threads)
8GB RAM
250 MB/s SSD
I got some interesting data, and decided to share
| Code: |
Kernel: 3.3.8 (gentoo-sources) x86_64
/usr/src/linux # make
+===============+===================+=======================+
| -j number | Minutes to finish | % speedup from -j1 |
+===============+===================+=======================+
| 1 | 5.216667 | 100% |
| 2 | 2.666667 | 195.6% |
| 3 | 1.85 | 282.0% |
| 4 | 1.5 | 347.8% |
| 5 | 1.383333 | 377.1% |
| 6 | 1.316667 | 396.2% |
| 7 | 1.25 | 417.3% |
| 8 | 1.2 | 434.7% |
| 9 | 1.2 | 434.7% |
| 10 | 1.183333 | 440.8% |
| 11 | 1.2 | 434.7% |
| 12 | 1.2 | 434.7% |
| 13 | 1.183333 | 440.8% |
| 14 | 1.183333 | 440.8% |
| 15 | 1.2 | 434.7% |
+===============+===================+=======================+
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