jebrosen / async-file-benchmark Goto Github PK

Hey, I have just swapped the order of executions (async-std goes first and tokio is second):

runtime         time per
async-std       6.134
tokio           3.256

async-std is now twice as slow. Yet, when I run it in the order it is in this repo:

runtime         time per
tokio           4.094
async-std       1.138

I have isolated tokio and async-std (commented away one of the two) and run separately:

runtime         time per
tokio           4.026

runtime         time per
async-std       5.345

I have even caught an outlier once with async-std:

runtime         time per
async-std       8.808

My environment:

• Arch Linux x64
• CPU: Intel Core i7-4710HQ
• rustc 1.39.0 (4560ea788 2019-11-04) (I have also tested with Nightly 1.40.0 from 2019-11-05)
• SSD Samsung MZ7TE512HMHP
• File 256kb (generated as stated in the README)

Running on OSX 10.15.1, initially tests were failing:

thread 'main' panicked at 'failed to time: Os { code: 2, kind: NotFound, message: "No such file or directory" }', src/libcore/result.rs:1165:5
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace.

after creating file.dat via touch file.dat tests failing complaining on too manu open files. I had to change system parameters to fix that:

ulimit -S -n 10000

Due to the coop system, this is very slow on Tokio due to this issue. The issue was fixed for join_all, but not try_join_all.