zbyszek at in.waw.pl
Wed Dec 10 19:18:15 UTC 2014
I run fedup on a beefy desktop machine (SSD 450MB/s, 24GB ram, 12 cores),
and started wondering why is takes so much time (1.5h or thereabouts for
~4500 packages). I noticed two things:
1. installing packages used just 1 core, and actually not even not at 100%,
and about 15MB/s were written to the disk.
perf top said that time was spent mostly in lzma_decode.
Is this expected?
2. at the end, fedup creates a log by running 'journalctl -a -m',
which is --all --merge. This seems a bit excessive. On this machine
I have 4.5 GB of logs from this machine, plus a few GB more from
other sources. journalctl is not very fast (which is another issue),
but even if it was, dumping all this is bound to be slow, and not
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