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As a convenience, we will try to assemble some build times for various hardware configurations here, so you can get an idea in advance of how long time it will take:

Processor(s)No. of coresMemoryTime (HH:MM)Notes
2 x Xeon X5570 2.93GHz2 x 436 GB00:19NIGHTLY_OPTIONS='-FnCDmprt'
4 x Opteron 6172 2.1 GHz4 x 12128 GB00:21NIGHTLY_OPTIONS='-FnCDmprt'
1 x Xeon E31270 E3-1270 3.4 GHz416 GB00:23NIGHTLY_OPTIONS='-FnCDmprt'
Xeon E3-1245V2 3.4 GHz416 GB00:31NIGHTLY_OPTIONS='-FnCDmprt'
Core i7-2600K 3.4 GHz48 GB00:35NIGHTLY_OPTIONS='-nClmprt'
2 x Xeon E5620 2.4 GHz2 x 448 GB00:38None
1 x Xeon E5607 2.27GHz1 x 412 GB00:46NIGHTLY_OPTIONS='-FnCDmprt'
Xeon E3-1245V2 3.4 GHz416 GB00:47NIGHTLY_OPTIONS='-FnCDlmprt' (with lint)
2 x Xeon E5540 2.53 GHz2 x 424 GB00:50With lint
2 x Xeon E5506 2.13 GHz2 x 424 GB00:50No dmake check
1 x Xeon X5650 2.67 GHz1 x 612 GB00:51With lint, default NIGHTLY_OPTIONS
2 x Xeon E5506 2.13 GHz2 x 424 GB01:03None
Core i7-960 3.2 GHz49 GB01:03With lint
2 x Xeon E5506 2.13 GHz2 x 416 GB01:06VMware Workstation guest
Core i7-930 2.8 GHz48 GB01:07VMware ESXi guest
Core 2 Quad Q6600 2.4 GHz42 GB01:16None
2 x Xeon E5310 1.6 GHz2 x 432 GB01:24None
1 x Athlon II X2 240 2.8 GHz22 GB01:27NIGHTLY_OPTIONS='-FnCDmprt', on a low end SSD
Core 2 Quad Q9300 2.5 GHz47 GB01:32None
2 x Xeon E5420 @ 2.50GHz2 x 44 GB01:33Default NIGHTLY_OPTIONS; an incremental rebuild takes 13 min to walk all Makefiles
2 x Opteron 2218HE 2.6 GHz2 x 216 GB01:42None
Core i5-540M 2.53 GHz24 GB01:54None
Core i3-370M 2.40 GHz22 GB02:30None
Core 2 Quad Q8200 2.33 GHz45 GB02:30Default NIGHTLY_OPTIONS.
Core 2 Duo T8300 2.3 GHz (T61)22 GB02:58VMware Workstation 2 CPUs
Core 2 Duo E6750 2.66 GHz28 GB02:59Sun Ultra 24 (with lint)
Core 2 Duo Celeron E3200 3.2 GHz24 GB03:282.4 GHz CPU over clocked to 3.2. Everything running on a low end SSD. With lint.
Core 2 Duo T5600 1.8 GHz23.3 GB04:26None
Opteron 146 2 GHz14 GB07:28None
4 x Dual-Core Opteron 8218 2.6 GHz (8-vCPU VM) 16 GB (2GB VM)35:47 + 9:05VirtualBox 3.0.12 VM, with 8 vCPUs and 2GB vRAM; local vHDD; with lint and default NIGHTLY_OPTIONS='-FnCDlmprt'

NOTE: Package repo did not get built at all with the first nightly run, only with the second, incremental nightly run (another 9 hours)

 

Notes:

  1. "Bare Metal" just slightly faster than VMware guest. On the other hand, VirtualBox painfully slow.
  2. More cores faster but not linear increase.
  3. SSD use seems to provide nice speedup.
  4. As expected, lint checking results in longer build times.