On 3/6/20 6:11 AM, Thomas Seeling wrote:
Hallo,
I did some comparing of build times.
Building was done on an older i5-6500 with 16 GB RAM, SATA harddisk and SSD.
9.1 build on SSD:
The SBU unit value is equal to 117 seconds.
Total time required to build the system: 79.6 SBU
8.3 build on HD:
The SBU unit value is equal to 107 seconds.
Total time required to build the system: 205.7 SBU
9.1 build on HD:
The SBU unit value is equal to 107 seconds.
Total time required to build the system: 294.9 SBU
I'm not surprised about the speed difference but I wonder why the SBU is
bigger for the SSD build? I was using the same jhalfs configuration file
for the latest 9.1 build.
A long time ago I did an LFS build on a ram disk and compared the time
to building on an actual disk. This was before SSDs were available.
The difference in build times was about 8.5%.
The build time in jhalfs can vary quite a bit. For my latest reference
build at -j1 on an ssd the time was 214 SBU at 104 seconds/SBU.
I sometimes build without tests or just a few tests and have seen times
as low as 29 SBU at -j10 on the same system.
-- Bruce
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