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
