As far as I know, the buffer won't be used by libuv/node after the write callback is called, that's one of the purposes of this callback. Someone please correct me if I'm wrong.
On Thu, Apr 19, 2012 at 11:08 AM, Joran Greef <[email protected]> wrote: > I need to write a few thousand 24 byte values to a TCP socket which > represents a WebSocket connection. > > I must retrieve them individually from disk, but I want to group a > thousand of them into each write, since the write represents a WebSocket > message and each message has additional message header overhead. > > At first I was instantiating a 24 byte buffer for each value, reading into > this from disk, iterating over the array of values, calculating the size, > creating a large buffer, copying these into it, and then writing this > aggregate buffer out to the socket. There were a few abstractions involved > and this was the simplest code flow. > > I was concerned about the needless copying and did a rough benchmark, and > creating a large buffer up front and writing directly into it is 3 times > faster than creating many small buffers, then creating a large buffer and > copying the small buffers. > > I would like to change tactics and create a buffer upfront, read the small > values directly into this from disk, and then write this to the socket. > After receiving the callback from the write (flushed to kernel buffers) I > would like to start writing into the same buffer at index 0. > > Is it safe to modify a buffer after it has been flushed to the kernel > buffer? > > -- > Job Board: http://jobs.nodejs.org/ > Posting guidelines: > https://github.com/joyent/node/wiki/Mailing-List-Posting-Guidelines > You received this message because you are subscribed to the Google > Groups "nodejs" group. > To post to this group, send email to [email protected] > To unsubscribe from this group, send email to > [email protected] > For more options, visit this group at > http://groups.google.com/group/nodejs?hl=en?hl=en > -- Job Board: http://jobs.nodejs.org/ Posting guidelines: https://github.com/joyent/node/wiki/Mailing-List-Posting-Guidelines You received this message because you are subscribed to the Google Groups "nodejs" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/nodejs?hl=en?hl=en
