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* Buffer reads in FdSource. Together with write buffering, this

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significantly cuts down the number of syscalls (e.g., for "nix-store
  -qR /var/run/current-system" via the daemon, it reduced the number
  of syscalls in the client from 29134 to 4766 and in the daemon from
  44266 to 20666).
This commit is contained in:
Eelco Dolstra 2011-12-15 12:32:08 +00:00
parent 3a48282b06
commit a3e0656cbb
2 changed files with 32 additions and 10 deletions
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18
src/libutil/serialise.hh
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@ -38,9 +38,7 @@ struct FdSink : Sink
FdSink() : fd(-1), bufSize(32 * 1024), bufPos(0), buffer(0) { }
FdSink(int fd, unsigned int bufSize = 32 * 1024)
: fd(fd), bufSize(bufSize), bufPos(0), buffer(0)
{
}
: fd(fd), bufSize(bufSize), bufPos(0), buffer(0) { }
~FdSink()
{
@ -58,15 +56,17 @@ struct FdSink : Sink
struct FdSource : Source
{
int fd;
unsigned int bufSize, bufPosIn, bufPosOut;
unsigned char * buffer;
FdSource()
{
fd = -1;
}
FdSource() : fd(-1), bufSize(32 * 1024), bufPosIn(0), bufPosOut(0), buffer(0) { }
FdSource(int fd)
FdSource(int fd, unsigned int bufSize = 32 * 1024)
: fd(fd), bufSize(bufSize), bufPosIn(0), bufPosOut(0), buffer(0) { }
~FdSource()
{
this->fd = fd;
if (buffer) delete[] buffer;
}
void operator () (unsigned char * data, unsigned int len);