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This was referenced Feb 14, 2025
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Ericson2314
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Feb 17, 2025
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| // XXX: determine the actual max value we can use from /proc. | ||
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| // FIXME: Should this be upstreamed into `startCommand` in Nix? | ||
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| int pipesize = 1024 * 1024; | ||
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| fcntl(ret->in.get(), F_SETPIPE_SZ, &pipesize); | ||
| fcntl(ret->out.get(), F_SETPIPE_SZ, &pipesize); |
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In NixOS/nix#10765 @vcunat determind this code was wrong. However, if the address is not too large it might make the pipe larger? Something should be done upstream.
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This is now done below too.
See
remoteStore->connPipeSize = 1024 * 1024;Setting a variable doesn't have any side-effects. We do that before any connection is established, however, and then that setting will be applied.
Ericson2314
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Feb 17, 2025
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| auto ret = master.startCommand(std::move(command), { | ||
| "-a", "-oBatchMode=yes", "-oConnectTimeout=60", "-oTCPKeepAlive=yes" |
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| if (machine->isLocalhost()) { | ||
| command.push_back("--builders"); | ||
| command.push_back(""); |
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| auto remoteStore = machine->storeUri.params.find("remote-store"); | ||
| if (remoteStore != machine->storeUri.params.end()) { | ||
| command.push_back("--store"); | ||
| command.push_back(shellEscape(remoteStore->second)); | ||
| } |
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This is handled by Nix.
In NixOS/nix#10748 it is extended with everything we need.
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In NixOS/nix#10748 it is extended with everything we need.
We are no longer explicit about reusing the same connection. However:
Nix's
poolmechanism will not close valid connections; it always keeps them around in case they are of use laterMax connections defaults to 1, so we won't open up multiple connections.
Between these two things, we are, in fact, guaranteed to reuse the same connection from one command/query to the next.