Commit Graph

7 Commits

Author SHA1 Message Date
Joe Thornber
7a85e47a20 [rust] squash clippy (linter) warnings 2020-06-10 16:46:38 +01:00
Joe Thornber
f90010e22a [pack/unpack] fix bug in file_utils::file_size() 2020-06-10 15:07:40 +01:00
Joe Thornber
380632565d [thin_metadata_{pack/unpack}] Fix get_nr_blocks()
It didn't work with block devices.
2020-06-10 14:38:42 +01:00
Joe Thornber
821628b004 [pack/unpack] add missing file. 2020-06-09 14:59:13 +01:00
Joe Thornber
409a660082 [pack/unpack] Get the functional tests working again.
There's some hard coded version numbers in the tests, but I'm
leaving for now since I'll rewrite in Rust to avoid too much
of a proliferation of languages.
2020-06-09 13:03:39 +01:00
Joe Thornber
db5a71a53c [rust tools] Get the tools version from autoconf 2020-06-09 10:23:52 +01:00
Joe Thornber
61de3f9287 [thin_metadata_pack/unpack] Replace C++ implementation with a Rust one.
The Rust implementation is multithreaded, performs better in general and
does custom compression of btree nodes to achieve much better compression
ratios.  unpack also checksums expanded metadata to validate it.

Format version has jumped to 3, no backwards compatibility, but I think
that's ok since we never made a release that contained the C++ version
of these tools.

Benchmarks
==========

On an 8 core, 16 hyperthread machine.

metadata 1G, full:

      Pack size    pack time     unpack time
------------------------------------------------------
C++      193M        50.3s          6.9s (no verify)
Rust      70M         1.4s          1.8s (verify)

metadata 16G, sparse:

       Pack size    pack time     unpack time
------------------------------------------------------
C++      21M          68s           1s   (no verify)
Rust      4M           8.6s         0.5s (verify)
2020-06-09 09:15:00 +01:00