Re: APFS: mmap page fault can take up to minutes after ftruncate/F_PREALLOCATE
Re: APFS: mmap page fault can take up to minutes after ftruncate/F_PREALLOCATE
- Subject: Re: APFS: mmap page fault can take up to minutes after ftruncate/F_PREALLOCATE
- From: Thomas Tempelmann via Filesystem-dev <email@hidden>
- Date: Thu, 19 Dec 2019 16:15:27 +0100
Out of curiosity, I just ran the test on my 10.13.6 system:
On HFS+, the tool finishes in about 5 seconds, ending up with a 4 GB file.
However, on a freshly created APFS vol (no encryption, on same SSD as the
HFS+ volume), it runs for about an hour! But no extra wait time around 2 GB.
I guess that APFS's mmap was so slow on 10.13 that the Apple engineers
optimized this in 10.14, but still with a hiccup at 2GB. And then fixed
that as well in 10.15.
Thomas
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