rawx: Performance improvements

[jfsmig]

SUMMARY

TL;DR: the golang rawx is now much faster but requires a new dependency on golang.org/x/sys/unix

• GET now manages to use the sendfile() function
• Larger buffers at upload
• file-descriptor oriented xattr operations
• syscalls parsimony
• post-reply asynchronous notifications with a buffered channel

Known TODO: make the golang rawx multi-tube.

ISSUE TYPE

enhancement

COMPONENT NAME

rawx

SDS VERSION

openio 4.4.3.dev6

[fvennetier]

This should be rebased on the master branch since it is a rather big change and requires a new dependency.

[codecov-io]

Codecov Report

Merging #1746 into master will increase coverage by 0.39%.
The diff coverage is 81.46%.

@@            Coverage Diff            @@
##           master   #1746      +/-   ##
=========================================
+ Coverage   79.12%   79.5%   +0.39%     
=========================================
  Files         361     377      +16     
  Lines       68034   69815    +1781     
  Branches     6885    6920      +35     
=========================================
+ Hits        53822   55501    +1679     
  Misses      14212   14212              
- Partials        0     102     +102

Impacted Files	Coverage Δ
rawx/rawx.go	85.19% <100%> (ø)
rawx/chunk_info.go	80.82% <100%> (ø)
rawx/logger.go	73.12% <100%> (ø)
rawx/chunkrepo.go	70.84% <100%> (ø)
rawx/handler_chunk.go	77.63% <67.57%> (ø)
rawx/filerepo.go	75% <76.11%> (ø)
rawx/notifier.go	70.59% <98.04%> (ø)
meta0v2/meta0_remote.c	74.29% <0%> (-8.57%)	⬇️
oio/account/client.py	81.61% <0%> (-5.74%)	⬇️
tests/functional/cli/admin/test_service_decache.py	81.25% <0%> (-4.16%)	⬇️
... and 72 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update a34b824...2d2d058. Read the comment docs.