Was going to look into this. I am getting 0 reads. This is on some old kingston ssd, ext4. On Mon, 24 Aug 2020 at 17:45, Jens Axboe <axboe@xxxxxxxxx> wrote: > > On 8/24/20 8:06 AM, Jens Axboe wrote: > > On 8/24/20 5:09 AM, Dmitry Shulyak wrote: > >> library that i am using https://github.com/dshulyak/uring > >> It requires golang 1.14, if installed, benchmark can be run with: > >> go test ./fs -run=xx -bench=BenchmarkReadAt/uring_8 -benchtime=1000000x > >> go test ./fs -run=xx -bench=BenchmarkReadAt/uring_5 -benchtime=8000000x > >> > >> note that it will setup uring instance per cpu, with shared worker pool. > >> it will take me too much time to implement repro in c, but in general > >> i am simply submitting multiple concurrent > >> read requests and watching read rate. > > > > I'm fine with trying your Go version, but I can into a bit of trouble: > > > > axboe@amd ~/g/go-uring (master)> > > go test ./fs -run=xx -bench=BenchmarkReadAt/uring_8 -benchtime=1000000x > > # github.com/dshulyak/uring/fixed > > fixed/allocator.go:38:48: error: incompatible type for field 2 in struct construction (cannot use type uint64 as type syscall.Iovec_len_t) > > 38 | iovec := []syscall.Iovec{{Base: &mem[0], Len: uint64(size)}} > > | ^ > > FAIL github.com/dshulyak/uring/fs [build failed] > > FAIL > > axboe@amd ~/g/go-uring (master)> go version > > go version go1.14.6 gccgo (Ubuntu 10.2.0-5ubuntu1~20.04) 10.2.0 linux/amd64 > > Alright, got it working. What device are you running this on? And am I > correct in assuming you get short reads, or rather 0 reads? What file > system? > > -- > Jens Axboe >
