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author | Eelco Dolstra <eelco.dolstra@logicblox.com> | 2016-09-16T16·54+0200 |
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committer | Eelco Dolstra <eelco.dolstra@logicblox.com> | 2016-09-16T16·54+0200 |
commit | 75989bdca773eedb8b8d1cc8a7675900358acd25 (patch) | |
tree | 2d1dce1431662f441cead67d8754e96eb4db6807 /src/resolve-system-dependencies/resolve-system-dependencies.cc | |
parent | 054be5025762c5e1c7e853c4fa5d7eed8da1727f (diff) |
Make computeFSClosure() single-threaded again
The fact that queryPathInfo() is synchronous meant that we needed a thread for every concurrent binary cache lookup, even though they end up being handled by the same download thread. Requiring hundreds of threads is not a good idea. So now there is an asynchronous version of queryPathInfo() that takes a callback function to process the result. Similarly, enqueueDownload() now takes a callback rather than returning a future. Thus, a command like nix path-info --store https://cache.nixos.org/ -r /nix/store/slljrzwmpygy1daay14kjszsr9xix063-nixos-16.09beta231.dccf8c5 that returns 4941 paths now takes 1.87s using only 2 threads (the main thread and the downloader thread). (This is with a prewarmed CloudFront.)
Diffstat (limited to 'src/resolve-system-dependencies/resolve-system-dependencies.cc')
0 files changed, 0 insertions, 0 deletions