On May 16, 2017 22:03, "Ian Lance Taylor" <i...@golang.org> wrote:
On Tue, May 16, 2017 at 9:26 PM, Manish Rai Jain <manishrj...@gmail.com> wrote: >> The runtime will spawn a new thread to replace the one that is blocked. > > Realized that after writing my last mail. And that actually explains some of > the other crashes we saw, about "too many threads", if we run tens of > thousands of goroutines to do these reads, one goroutine per read. > > It is obviously lot more expensive to spawn a new OS thread. It seems like > this exact same problem was already solved for network via netpoller > (https://morsmachine.dk/netpoller). Blocking OS threads for disk reads made > sense for HDDs, which could only do 200 IOPS; for SSDs we'd need a solution > based on async I/O. Note that in the upcoming Go 1.9 release we now use the netpoller for the os package as well. However, it's not as effective as one would hope, because on GNU/Linux you can't use epoll for disk files. There's a not very well documented API to make AIO completions kick an eventfd. It mainly helps with pipes. Ian -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
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