bernt at bah.homeip.net
Wed May 18 10:37:17 UTC 2011
2011-05-18 02:50, Devin Teske:
> Hi List,
> What's the fastest anyone has every completed buildworld on a single machine?
> The reason I ask is because we just got some new hardware in and decided to
> benchmark it using buildworld.
> Just as a quick test, we decided to perform "make -j 48 buildworld". We finished
> in approximately 9 minutes.
For me on the desktopsystem 33 min with make -j 24 buildworld
Half an hour is half the lunchbreak.
FreeBSD 8.2-STABLE #0
CPU: AMD Athlon(tm) II X2 250 Processor (3013.63-MHz K8-class CPU)
Origin = "AuthenticAMD" Id = 0x100f62 Family = 10 Model = 6 Stepping = 2
real memory = 17179869184 (16384 MB)
avail memory = 16530083840 (15764 MB)
FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs
FreeBSD/SMP: 1 package(s) x 2 core(s)
> I think that we can improve upon that, but am having a bit of difficulty.
> Can anyone offer any pointers in how to achieve the fastest buildworld possible?
> No particular reason... we're just trying to push the boundaries of what's
Check the handbook, single user comes to mind.
> For reference the machine we're compiling on is a dual-socket Nehalem Xeon
> (six-core per proc; HTT enabled; 24 total CPUs presented by APIC) with 48GB of
> RAM, an LSI MegaSAS RAID controller, and an LSI 2Gbps Fibre Channel HBA going to
> an 8TB NEC D-4 array.
> ASIDE: Doing the same buildworld on a 4-disk ZFS raidz yielded approximately
> 11-minutes. Performing the buildworld on the NEC D-4 over the 2Gbps FC HBA
> yielded approximately 12 minutes. And for some unknown reason, performing
> buildworld on tmpfs yielded 13 minutes.
> We thought going tmpfs would make things faster, but that resulted in over 13
> minutes (huh? you'd think a RAM disk would be smoking compared to even the SSDs
> that we used to achieve ~9 min; do note that we did make sure to nullfs mount a
> tmpfs-based directory onto /usr/obj -- though the performance of that nullfs
> mount might have hurt the test, not sure).
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