RemoteIO: use a pinned bounce buffer #519
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madsbk
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vuule
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Oct 29, 2024
| @@ -450,6 +538,10 @@ class RemoteHandle { | |||
| curl.perform(); | |||
| } else { | |||
| PushAndPopContext c(get_context_from_pointer(buf)); | |||
| // We use a bounce buffer to avoid many small memory copies to device. Libcurl has a | |||
| // maximum chunk size of 16kb (`CURL_MAX_WRITE_SIZE`) but chunks are often much smaller. | |||
| detail::BounceBufferH2D bounce_buffer(detail::StreamsByThread::get(), buf); | |||
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how big is the bounce buffer?
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16MiB, it is taken from the same memory pool as the one POSIX IO uses.
Added this to the docstring:
* When reading into device memory, a bounce buffer is used to avoid many small memory
* copies to device. Use `kvikio::default::bounce_buffer_size_reset()` to set the size
* of this bounce buffer (default 16 MiB).
…o remote-io-pinned-bounce-buffer
wence-
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Oct 30, 2024
Co-authored-by: Lawrence Mitchell <[email protected]>
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We use a bounce buffer to avoid many small memory copies to device. Libcurl has a maximum chunk size of 16kb (
CURL_MAX_WRITE_SIZE) but chunks are often much smaller.For now, the bounce buffer isn't double buffered, let's defer that to later: #520