Details
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Improvement
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Status: Backlog
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Major - P3
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Resolution: Unresolved
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None
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None
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None
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Server Development Platform
Description
One of the weird things I learned while working on ninja is that install is significantly faster than cp. I don't know why this is, but it is reproducible across many systems and filesystems, etc. For example, this is running on a virtual workstation (c5.4xl ubuntu 18.04 xfs):
ubuntu@ip-10-122-10-16:~$ dd if=/dev/zero of=src bs=1M count=100; sync;
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100+0 records in
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100+0 records out
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104857600 bytes (105 MB, 100 MiB) copied, 0.189798 s, 552 MB/s
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ubuntu@ip-10-122-10-16:~$ for i in `seq 10`; do time install src dest; done; sync;
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real 0m0.061s
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user 0m0.000s
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sys 0m0.061s
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real 0m0.064s
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user 0m0.000s
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sys 0m0.064s
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real 0m0.061s
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user 0m0.000s
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sys 0m0.061s
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real 0m0.061s
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user 0m0.000s
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sys 0m0.061s
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real 0m0.061s
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user 0m0.000s
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sys 0m0.061s
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real 0m0.061s
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user 0m0.000s
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sys 0m0.061s
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real 0m0.061s
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user 0m0.000s
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sys 0m0.061s
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real 0m0.061s
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user 0m0.000s
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sys 0m0.061s
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real 0m0.061s
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user 0m0.000s
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sys 0m0.061s
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real 0m0.060s
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user 0m0.000s
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sys 0m0.061s
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ubuntu@ip-10-122-10-16:~$ for i in `seq 10`; do time cp src dest; done; sync;
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real 0m0.234s
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user 0m0.000s
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sys 0m0.071s
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real 0m0.226s
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user 0m0.004s
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sys 0m0.067s
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real 0m0.220s
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user 0m0.000s
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sys 0m0.073s
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real 0m0.211s
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user 0m0.000s
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sys 0m0.070s
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real 0m0.223s
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user 0m0.000s
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sys 0m0.075s
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real 0m0.335s
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user 0m0.000s
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sys 0m0.075s
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real 0m0.400s
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user 0m0.000s
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sys 0m0.073s
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real 0m0.400s
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user 0m0.004s
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sys 0m0.066s
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real 0m0.398s
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user 0m0.000s
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sys 0m0.073s
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real 0m0.399s
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user 0m0.000s
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sys 0m0.070s
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I have tried on my laptop (WSL2 + Arch ext4 on nvme) and the results were similar. Including the weirdness of later runs of cp being slower than earlier runs. �
Attachments
Issue Links
- is related to
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SERVER-48203 Support --install-action for Ninja builds
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- Closed
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