libutil: don't memset 64k in drainFD
this is not needed and introduces a bunch of memset calls, making up for 3% of valgrind cycle estimation *alone*. real-world impact is a lot lower on our test machine, but we suspect that less powerful machines would see an impact from dropping this. Change-Id: Iad10e9d556e64fdeb0bee0059a4e52520058d11e
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@ -745,7 +745,7 @@ void drainFD(int fd, Sink & sink, bool block)
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}
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});
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std::vector<unsigned char> buf(64 * 1024);
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std::array<unsigned char, 64 * 1024> buf;
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while (1) {
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checkInterrupt();
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ssize_t rd = read(fd, buf.data(), buf.size());
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