From 582aa00bdffb27abcf1b27d541b4c231a395d3b8 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Ren=C3=A9=20Scharfe?= Date: Sun, 2 May 2010 15:04:41 +0200 Subject: git diff too slow for a file Ever since the xdiff library had been introduced to git, all its callers have used the flag XDF_NEED_MINIMAL. It makes sure that the smallest possible diff is produced, but that takes quite some time if there are lots of differences that can be expressed in multiple ways. This flag makes a difference for only 0.1% of the non-merge commits in the git repo of Linux, both in terms of diff size and execution time. The patches there are mostly nice and small. SungHyun Nam however reported a case in a different repo where a diff took more than 20 times longer to generate with XDF_NEED_MINIMAL than without. Rebasing became really slow. This patch removes this flag from all callers. The default of xdiff is saner because it has minimal to no impact in the normal case of small diffs and doesn't incur that much of a speed penalty for large ones. A follow-up patch may introduce a command line option to set the flag if the user needs it, similar to GNU diff's -d/--minimal. Signed-off-by: Rene Scharfe Signed-off-by: Junio C Hamano diff --git a/builtin-blame.c b/builtin-blame.c index fc15863..8deeee1 100644 --- a/builtin-blame.c +++ b/builtin-blame.c @@ -39,7 +39,7 @@ static int show_root; static int reverse; static int blank_boundary; static int incremental; -static int xdl_opts = XDF_NEED_MINIMAL; +static int xdl_opts; static enum date_mode blame_date_mode = DATE_ISO8601; static size_t blame_date_width; diff --git a/builtin-merge-file.c b/builtin-merge-file.c index 1e70073..e5e860f 100644 --- a/builtin-merge-file.c +++ b/builtin-merge-file.c @@ -25,7 +25,7 @@ int cmd_merge_file(int argc, const char **argv, const char *prefix) const char *names[3] = { NULL, NULL, NULL }; mmfile_t mmfs[3]; mmbuffer_t result = {NULL, 0}; - xmparam_t xmp = {{XDF_NEED_MINIMAL}}; + xmparam_t xmp = {{0}}; int ret = 0, i = 0, to_stdout = 0; int level = XDL_MERGE_ZEALOUS_ALNUM; int style = 0, quiet = 0; diff --git a/builtin-merge-tree.c b/builtin-merge-tree.c index a4a4f2c..fc00d79 100644 --- a/builtin-merge-tree.c +++ b/builtin-merge-tree.c @@ -106,7 +106,7 @@ static void show_diff(struct merge_list *entry) xdemitconf_t xecfg; xdemitcb_t ecb; - xpp.flags = XDF_NEED_MINIMAL; + xpp.flags = 0; memset(&xecfg, 0, sizeof(xecfg)); xecfg.ctxlen = 3; ecb.outf = show_outf; diff --git a/builtin-rerere.c b/builtin-rerere.c index 34f9ace..0048f9e 100644 --- a/builtin-rerere.c +++ b/builtin-rerere.c @@ -89,7 +89,7 @@ static int diff_two(const char *file1, const char *label1, printf("--- a/%s\n+++ b/%s\n", label1, label2); fflush(stdout); memset(&xpp, 0, sizeof(xpp)); - xpp.flags = XDF_NEED_MINIMAL; + xpp.flags = 0; memset(&xecfg, 0, sizeof(xecfg)); xecfg.ctxlen = 3; ecb.outf = outf; diff --git a/combine-diff.c b/combine-diff.c index 3480dae..13a8128 100644 --- a/combine-diff.c +++ b/combine-diff.c @@ -221,7 +221,7 @@ static void combine_diff(const unsigned char *parent, unsigned int mode, parent_file.ptr = grab_blob(parent, mode, &sz); parent_file.size = sz; memset(&xpp, 0, sizeof(xpp)); - xpp.flags = XDF_NEED_MINIMAL; + xpp.flags = 0; memset(&xecfg, 0, sizeof(xecfg)); memset(&state, 0, sizeof(state)); state.nmask = nmask; diff --git a/diff.c b/diff.c index edec0f6..0924274 100644 --- a/diff.c +++ b/diff.c @@ -714,7 +714,7 @@ static void diff_words_show(struct diff_words_data *diff_words) memset(&xecfg, 0, sizeof(xecfg)); diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex); diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex); - xpp.flags = XDF_NEED_MINIMAL; + xpp.flags = 0; /* as only the hunk header will be parsed, we need a 0-context */ xecfg.ctxlen = 0; xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words, @@ -1743,7 +1743,7 @@ static void builtin_diff(const char *name_a, check_blank_at_eof(&mf1, &mf2, &ecbdata); ecbdata.file = o->file; ecbdata.header = header.len ? &header : NULL; - xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts; + xpp.flags = o->xdl_opts; xecfg.ctxlen = o->context; xecfg.interhunkctxlen = o->interhunkcontext; xecfg.flags = XDL_EMIT_FUNCNAMES; @@ -1833,7 +1833,7 @@ static void builtin_diffstat(const char *name_a, const char *name_b, memset(&xpp, 0, sizeof(xpp)); memset(&xecfg, 0, sizeof(xecfg)); - xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts; + xpp.flags = o->xdl_opts; xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat, &xpp, &xecfg, &ecb); } @@ -1882,7 +1882,7 @@ static void builtin_checkdiff(const char *name_a, const char *name_b, memset(&xpp, 0, sizeof(xpp)); memset(&xecfg, 0, sizeof(xecfg)); xecfg.ctxlen = 1; /* at least one context line */ - xpp.flags = XDF_NEED_MINIMAL; + xpp.flags = 0; xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data, &xpp, &xecfg, &ecb); @@ -3419,7 +3419,7 @@ static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1) len2, p->two->path); git_SHA1_Update(&ctx, buffer, len1); - xpp.flags = XDF_NEED_MINIMAL; + xpp.flags = 0; xecfg.ctxlen = 3; xecfg.flags = XDL_EMIT_FUNCNAMES; xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data, diff --git a/merge-file.c b/merge-file.c index fd34d76..cafc274 100644 --- a/merge-file.c +++ b/merge-file.c @@ -60,7 +60,7 @@ static int generate_common_file(mmfile_t *res, mmfile_t *f1, mmfile_t *f2) xdemitcb_t ecb; memset(&xpp, 0, sizeof(xpp)); - xpp.flags = XDF_NEED_MINIMAL; + xpp.flags = 0; memset(&xecfg, 0, sizeof(xecfg)); xecfg.ctxlen = 3; xecfg.flags = XDL_EMIT_COMMON; -- cgit v0.10.2-6-g49f6