On 2020-10-06 12:32, Luca Milanesio wrote:On 6 Oct 2020, at 20:16, kaushikl@xxxxxxxxxxxxxx wrote:
Hi,
We have noticed that creating a new ref takes ~600ms on a repository with around 100k packed-refs.
My test repository:
$ git count-objects -v
count: 0
size: 0
in-pack: 100042
packs: 1
size-pack: 9734
prune-packable: 0
garbage: 0
size-garbage: 0
$ find refs/ -type f | wc -l
0
Specs:
Machine has 32 cores and 250G RAM.
$ uname -r
4.4.0-165-generic
$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 16.04.6 LTS
Release: 16.04
Codename: xenial
Jgit version is 5.9
$ java -version
openjdk version "1.8.0_242"
OpenJDK Runtime Environment (build 1.8.0_242-8u242-b08-0ubuntu3~16.04-b08)
OpenJDK 64-Bit Server VM (build 25.242-b08, mixed mode)
Consider a small program[1] which creates a ref 'simple'. On executing the program on my test repository, I see output:
simple: 677 ms
This seems slow. Is this expected behavior with jgit?
Can you share the generated .gitconfig?
(When you use JGit on a filesystem, it performs the computation of the
filesystem latency)
$ cat config[core] repositoryformatversion = 0 filemode = true bare = false logallrefupdates = true trustFolderStat = false[repack] usedeltabaseoffset = true[pack] compression = 9 indexversion = 2 threads = 6 windowmemory = 2g window = 250 depth = 50[gc] autopacklimit = 4 packrefs = true reflogexpire = never reflogexpireunreachable = never auto = 0[receive] denyNonFastForwards = false
No, I mean the ~/.gitconfig of the user. If you are running Gerrit v3.1 or later, then it is $GERRIT_SITE/etc/jgit.config. Is this a local disk or a mounted NFS share?
SSD or spinning?
This is on a local spinning disk.
Is the disk fragmented?
Luca. Luca.
[1]
package test;
import java.io.File;
import java.io.IOException;
import java.util.concurrent.TimeUnit;
import org.eclipse.jgit.api.Git;
import org.eclipse.jgit.api.errors.GitAPIException;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.jgit.revwalk.RevWalk;
public class Test {
public static void main(String[] args) {
try {
String path = null;
if (args.length == 1) {
path = args[0];
} else {
System.out.println("Repo path must be specified.");
System.exit(1);
}
String branch = "simple";
try (Git git = Git.open(new File(path))) {
Repository repo = git.getRepository();
RevWalk walk = new RevWalk(repo);
RevCommit commit = walk.parseCommit(repo.exactRef("refs/heads/master").getObjectId());
long startTimeInNanoSecs = System.nanoTime();
git.branchCreate().setName(branch).setStartPoint(commit).call();
long estimatedTimeInNanoSecs = System.nanoTime() - startTimeInNanoSecs;
System.out.println(branch + ": " + TimeUnit.NANOSECONDS.toMillis(estimatedTimeInNanoSecs) + " ms");
}
} catch (IllegalStateException | GitAPIException | IOException e) {
e.printStackTrace();
}
}
}
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