https://bugzilla.samba.org/show_bug.cgi?id=8512
Summary: rsync -a slower than cp -a
Product: rsync
Version: 3.1.0
Platform: All
OS/Version: All
Status: NEW
Severity: normal
Priority: P5
Component: core
AssignedTo: way...@samba.org
ReportedBy: linux.n...@bucksch.org
QAContact: rsync...@samba.org
Reproduction:
1. du /foo/bigfile
2. echo 3 > /proc/sys/vm/drop_caches
3. time rsync -avp /foo/bigfile /bar/bigfile
4. echo 3 > /proc/sys/vm/drop_caches
5. time cp -a /foo/bigfile /bar/bigfile
Actual result:
1. ~1286 MB
3. 27.9s, 45.9 MB/s per calc, 45.61 MB/s according to rsync
5. 14.6s, 88.1 MB/s per calc
In other words, cp is *almost twice as fast* as rsync. On a single big file
where no comparison is necessary.
Expected result:
When copying a file, rsync is as fast as cp.
rsync is great, but this is a real putoff. I don't see a good reason either, as
the two programs perform the same function in this case. Must be some design
problem. Find the bottleneck and eliminate it, please.
Importance:
rsync advertizes with its speed.
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