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perf: add command for measuring revlog chunk operations...
perf: add command for measuring revlog chunk operations Upcoming commits will teach revlogs to leverage the new compression engine API so that new compression formats can more easily be leveraged in revlogs. We want to be sure this refactoring doesn't regress performance. So this commit introduces "perfrevchunks" to explicitly test performance of reading, decompressing, and recompressing revlog chunks. Here is output when run on the mozilla-unified repo: $ hg perfrevlogchunks -c ! read ! wall 0.346603 comb 0.350000 user 0.340000 sys 0.010000 (best of 28) ! read w/ reused fd ! wall 0.337707 comb 0.340000 user 0.320000 sys 0.020000 (best of 30) ! read batch ! wall 0.013206 comb 0.020000 user 0.000000 sys 0.020000 (best of 221) ! read batch w/ reused fd ! wall 0.013259 comb 0.030000 user 0.010000 sys 0.020000 (best of 222) ! chunk ! wall 1.909939 comb 1.910000 user 1.900000 sys 0.010000 (best of 6) ! chunk batch ! wall 1.750677 comb 1.760000 user 1.740000 sys 0.020000 (best of 6) ! compress ! wall 5.668004 comb 5.670000 user 5.670000 sys 0.000000 (best of 3) $ hg perfrevlogchunks -m ! read ! wall 0.365834 comb 0.370000 user 0.350000 sys 0.020000 (best of 26) ! read w/ reused fd ! wall 0.350160 comb 0.350000 user 0.320000 sys 0.030000 (best of 28) ! read batch ! wall 0.024777 comb 0.020000 user 0.000000 sys 0.020000 (best of 119) ! read batch w/ reused fd ! wall 0.024895 comb 0.030000 user 0.000000 sys 0.030000 (best of 118) ! chunk ! wall 2.514061 comb 2.520000 user 2.480000 sys 0.040000 (best of 4) ! chunk batch ! wall 2.380788 comb 2.380000 user 2.360000 sys 0.020000 (best of 5) ! compress ! wall 9.815297 comb 9.820000 user 9.820000 sys 0.000000 (best of 3) We already see some interesting data, such as how much slower non-batched chunk reading is and that zlib compression appears to be >2x slower than decompression. I didn't have the data when I wrote this commit message, but I ran this on Mozilla's NFS-based Mercurial server and the time for reading with a reused file descriptor was faster. So I think it is worth testing both with and without file descriptor reuse so we can make informed decisions about recycling file descriptors.
Yuya Nishihara - - Load All Authors

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test-diff-upgrade.t
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#require execbit
$ cat <<EOF >> $HGRCPATH
> [extensions]
> autodiff = $TESTDIR/autodiff.py
> [diff]
> nodates = 1
> EOF
$ hg init repo
$ cd repo
make a combination of new, changed and deleted file
$ echo regular > regular
$ echo rmregular > rmregular
$ $PYTHON -c "file('bintoregular', 'wb').write('\0')"
$ touch rmempty
$ echo exec > exec
$ chmod +x exec
$ echo rmexec > rmexec
$ chmod +x rmexec
$ echo setexec > setexec
$ echo unsetexec > unsetexec
$ chmod +x unsetexec
$ echo binary > binary
$ $PYTHON -c "file('rmbinary', 'wb').write('\0')"
$ hg ci -Am addfiles
adding binary
adding bintoregular
adding exec
adding regular
adding rmbinary
adding rmempty
adding rmexec
adding rmregular
adding setexec
adding unsetexec
$ echo regular >> regular
$ echo newregular >> newregular
$ rm rmempty
$ touch newempty
$ rm rmregular
$ echo exec >> exec
$ echo newexec > newexec
$ echo bintoregular > bintoregular
$ chmod +x newexec
$ rm rmexec
$ chmod +x setexec
$ chmod -x unsetexec
$ $PYTHON -c "file('binary', 'wb').write('\0\0')"
$ $PYTHON -c "file('newbinary', 'wb').write('\0')"
$ rm rmbinary
$ hg addremove -s 0
adding newbinary
adding newempty
adding newexec
adding newregular
removing rmbinary
removing rmempty
removing rmexec
removing rmregular
git=no: regular diff for all files
$ hg autodiff --git=no
diff -r a66d19b9302d binary
Binary file binary has changed
diff -r a66d19b9302d bintoregular
Binary file bintoregular has changed
diff -r a66d19b9302d exec
--- a/exec
+++ b/exec
@@ -1,1 +1,2 @@
exec
+exec
diff -r a66d19b9302d newbinary
Binary file newbinary has changed
diff -r a66d19b9302d newexec
--- /dev/null
+++ b/newexec
@@ -0,0 +1,1 @@
+newexec
diff -r a66d19b9302d newregular
--- /dev/null
+++ b/newregular
@@ -0,0 +1,1 @@
+newregular
diff -r a66d19b9302d regular
--- a/regular
+++ b/regular
@@ -1,1 +1,2 @@
regular
+regular
diff -r a66d19b9302d rmbinary
Binary file rmbinary has changed
diff -r a66d19b9302d rmexec
--- a/rmexec
+++ /dev/null
@@ -1,1 +0,0 @@
-rmexec
diff -r a66d19b9302d rmregular
--- a/rmregular
+++ /dev/null
@@ -1,1 +0,0 @@
-rmregular
git=yes: git diff for single regular file
$ hg autodiff --git=yes regular
diff --git a/regular b/regular
--- a/regular
+++ b/regular
@@ -1,1 +1,2 @@
regular
+regular
git=auto: regular diff for regular files and non-binary removals
$ hg autodiff --git=auto regular newregular rmregular rmexec
diff -r a66d19b9302d newregular
--- /dev/null
+++ b/newregular
@@ -0,0 +1,1 @@
+newregular
diff -r a66d19b9302d regular
--- a/regular
+++ b/regular
@@ -1,1 +1,2 @@
regular
+regular
diff -r a66d19b9302d rmexec
--- a/rmexec
+++ /dev/null
@@ -1,1 +0,0 @@
-rmexec
diff -r a66d19b9302d rmregular
--- a/rmregular
+++ /dev/null
@@ -1,1 +0,0 @@
-rmregular
$ for f in exec newexec setexec unsetexec binary newbinary newempty rmempty rmbinary bintoregular; do
> echo
> echo '% git=auto: git diff for' $f
> hg autodiff --git=auto $f
> done
% git=auto: git diff for exec
diff -r a66d19b9302d exec
--- a/exec
+++ b/exec
@@ -1,1 +1,2 @@
exec
+exec
% git=auto: git diff for newexec
diff --git a/newexec b/newexec
new file mode 100755
--- /dev/null
+++ b/newexec
@@ -0,0 +1,1 @@
+newexec
% git=auto: git diff for setexec
diff --git a/setexec b/setexec
old mode 100644
new mode 100755
% git=auto: git diff for unsetexec
diff --git a/unsetexec b/unsetexec
old mode 100755
new mode 100644
% git=auto: git diff for binary
diff --git a/binary b/binary
index a9128c283485202893f5af379dd9beccb6e79486..09f370e38f498a462e1ca0faa724559b6630c04f
GIT binary patch
literal 2
Jc${Nk0000200961
% git=auto: git diff for newbinary
diff --git a/newbinary b/newbinary
new file mode 100644
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..f76dd238ade08917e6712764a16a22005a50573d
GIT binary patch
literal 1
Ic${MZ000310RR91
% git=auto: git diff for newempty
diff --git a/newempty b/newempty
new file mode 100644
% git=auto: git diff for rmempty
diff --git a/rmempty b/rmempty
deleted file mode 100644
% git=auto: git diff for rmbinary
diff --git a/rmbinary b/rmbinary
deleted file mode 100644
index f76dd238ade08917e6712764a16a22005a50573d..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
GIT binary patch
literal 0
Hc$@<O00001
% git=auto: git diff for bintoregular
diff --git a/bintoregular b/bintoregular
index f76dd238ade08917e6712764a16a22005a50573d..9c42f2b6427d8bf034b7bc23986152dc01bfd3ab
GIT binary patch
literal 13
Uc$`bh%qz(+N=+}#Ni5<5043uE82|tP
git=warn: regular diff with data loss warnings
$ hg autodiff --git=warn
diff -r a66d19b9302d binary
Binary file binary has changed
diff -r a66d19b9302d bintoregular
Binary file bintoregular has changed
diff -r a66d19b9302d exec
--- a/exec
+++ b/exec
@@ -1,1 +1,2 @@
exec
+exec
diff -r a66d19b9302d newbinary
Binary file newbinary has changed
diff -r a66d19b9302d newexec
--- /dev/null
+++ b/newexec
@@ -0,0 +1,1 @@
+newexec
diff -r a66d19b9302d newregular
--- /dev/null
+++ b/newregular
@@ -0,0 +1,1 @@
+newregular
diff -r a66d19b9302d regular
--- a/regular
+++ b/regular
@@ -1,1 +1,2 @@
regular
+regular
diff -r a66d19b9302d rmbinary
Binary file rmbinary has changed
diff -r a66d19b9302d rmexec
--- a/rmexec
+++ /dev/null
@@ -1,1 +0,0 @@
-rmexec
diff -r a66d19b9302d rmregular
--- a/rmregular
+++ /dev/null
@@ -1,1 +0,0 @@
-rmregular
data lost for: binary
data lost for: bintoregular
data lost for: newbinary
data lost for: newempty
data lost for: newexec
data lost for: rmbinary
data lost for: rmempty
data lost for: setexec
data lost for: unsetexec
git=abort: fail on execute bit change
$ hg autodiff --git=abort regular setexec
abort: losing data for setexec
[255]
git=abort: succeed on regular file
$ hg autodiff --git=abort regular
diff -r a66d19b9302d regular
--- a/regular
+++ b/regular
@@ -1,1 +1,2 @@
regular
+regular
$ cd ..