* [ANN] mwrap 2.1.0 mwrap - LD_PRELOAD malloc wrapper for Ruby
@ 2018-08-11 4:31 5% Eric Wong
0 siblings, 0 replies; 2+ results
From: Eric Wong @ 2018-08-11 4:31 UTC (permalink / raw)
To: ruby-talk, mwrap-public
Changes:
mwrap 2.1.0 - heap_page_body struct tracking
This release enables tracking of memalign allocations for
"struct heap_page_body" in the Ruby GC. This can be useful
for tracking deathspans (time between free and re-allocation)
of heap page bodies which can cause fragmentation in some
malloc implementations, including glibc.
The documentation for it is available at:
https://80x24.org/mwrap/Mwrap/HeapPageBody.html
And a live demo runs at:
https://80x24.org/MWRAP/heap_pages
This release also includes global counters for
Mwrap.total_bytes_allocated and Mwrap.total_bytes_freed
10 changes since v2.0.0 (2018-07-20):
add olddoc.yml to generate links in page footers
add .olddoc.yml to MANIFEST
gemspec: use "git describe" output for prereleases
add global counters for total bytes allocated/freed
keep stats for memalign-ed heap_page_body in Ruby
remove "memalign:" MWRAP option
allow dump_heap: mask via MWRAP env
tweak hpb stats destructor output
struct acc: use 64-bit counters
doc: 2.1 pre-release updates
About:
mwrap is designed to answer the question:
Which lines of Ruby are hitting malloc the most?
mwrap wraps all malloc-family calls to trace the Ruby source
location of such calls and bytes allocated at each callsite.
As of mwrap 2.0.0, it can also function as a leak detector
and show live allocations at every call site. Depending on
your application and workload, the overhead is roughly a 50%
increase memory and runtime.
It works best for allocations under GVL, but tries to track
numeric caller addresses for allocations made without GVL so you
can get an idea of how much memory usage certain extensions and
native libraries use.
It requires the concurrent lock-free hash table from the
Userspace RCU project: https://liburcu.org/
It does not require recompiling or rebuilding Ruby, but only
supports Ruby trunk (2.6.0dev+) on a few platforms:
* GNU/Linux
* FreeBSD (tested 11.1)
It may work on NetBSD, OpenBSD and DragonFly BSD.
Mailing list and archives:
https://80x24.org/mwrap-public/
nntp://80x24.org/inbox.comp.lang.ruby.mwrap
mailto:mwrap-public@80x24.org (no HTML mail, please)
Note: I might not be able answer questions about this for a few days.
git clone https://80x24.org/mwrap.git
homepage + rdoc: https://80x24.org/mwrap/
^ permalink raw reply [relevance 5%]
* [PATCH] allow dump_heap: mask via MWRAP env
@ 2018-08-10 22:24 7% Eric Wong
0 siblings, 0 replies; 2+ results
From: Eric Wong @ 2018-08-10 22:24 UTC (permalink / raw)
To: mwrap-public
This is useful for people who do not want to modify existing
Ruby programs.
---
ext/mwrap/mwrap.c | 73 +++++++++++++++++++++++++++++++++++++++++-----
test/test_mwrap.rb | 7 +++++
2 files changed, 72 insertions(+), 8 deletions(-)
diff --git a/ext/mwrap/mwrap.c b/ext/mwrap/mwrap.c
index 986ca70..138384d 100644
--- a/ext/mwrap/mwrap.c
+++ b/ext/mwrap/mwrap.c
@@ -345,14 +345,20 @@ acc_mean(const struct acc *acc)
return DBL2NUM(acc->nr ? acc->mean : HUGE_VAL);
}
-static VALUE
-acc_stddev(const struct acc *acc)
+static double
+acc_stddev_dbl(const struct acc *acc)
{
if (acc->nr > 1) {
double variance = acc->m2 / (acc->nr - 1);
- DBL2NUM(sqrt(variance));
+ return sqrt(variance);
}
- return INT2NUM(0);
+ return 0.0;
+}
+
+static VALUE
+acc_stddev(const struct acc *acc)
+{
+ return DBL2NUM(acc_stddev_dbl(acc));
}
static struct src_loc *totals_add_rcu(struct src_loc *k)
@@ -1276,9 +1282,15 @@ static VALUE hpb_stat(int argc, VALUE *argv, VALUE hpb)
* * dump_fd: a writable FD to dump to
* * dump_path: a path to dump to, the file is opened in O_APPEND mode
* * dump_min: the minimum allocation size (total) to dump
+ * * dump_heap: mask of heap_page_body statistics to dump
*
* If both `dump_fd' and `dump_path' are specified, dump_path takes
* precedence.
+ *
+ * dump_heap bitmask
+ * * 0x01 - summary stats (same info as HeapPageBody.stat)
+ * * 0x02 - all live heaps (similar to HeapPageBody.each)
+ * * 0x04 - skip non-heap_page_body-related output
*/
void Init_mwrap(void)
{
@@ -1328,6 +1340,44 @@ void Init_mwrap(void)
--locating;
}
+enum {
+ DUMP_HPB_STATS = 0x1,
+ DUMP_HPB_EACH = 0x2,
+ DUMP_HPB_EXCL = 0x4,
+};
+
+static void dump_hpb(FILE *fp, unsigned flags)
+{
+ if (flags & DUMP_HPB_STATS) {
+ fprintf(fp,
+ "lifespan_max: %zu\n"
+ "lifespan_min: %zu\n"
+ "lifespan_mean: %0.3f\n"
+ "lifespan_stddev: %0.3f\n"
+ "deathspan_max: %zu\n"
+ "deathspan_min: %zu\n"
+ "deathspan_mean: %0.3f\n"
+ "deathspan_stddev: %0.3f\n",
+ hpb_stats.alive.max,
+ hpb_stats.alive.min,
+ hpb_stats.alive.mean,
+ acc_stddev_dbl(&hpb_stats.alive),
+ hpb_stats.reborn.max,
+ hpb_stats.reborn.min,
+ hpb_stats.reborn.mean,
+ acc_stddev_dbl(&hpb_stats.reborn));
+ }
+ if (flags & DUMP_HPB_EACH) {
+ struct alloc_hdr *h;
+
+ cds_list_for_each_entry(h, &hpb_stats.bodies, anode) {
+ void *addr = hdr2ptr(h);
+
+ fprintf(fp, "%p\t%zu\n", addr, h->as.live.gen);
+ }
+ }
+}
+
/* rb_cloexec_open isn't usable by non-Ruby processes */
#ifndef O_CLOEXEC
# define O_CLOEXEC 0
@@ -1338,10 +1388,12 @@ static void mwrap_dump_destructor(void)
{
const char *opt = getenv("MWRAP");
const char *modes[] = { "a", "a+", "w", "w+", "r+" };
- struct dump_arg a;
+ struct dump_arg a = { .min = 0 };
size_t i;
int dump_fd;
+ unsigned dump_heap = 0;
char *dump_path;
+ char *s;
if (!opt)
return;
@@ -1368,8 +1420,11 @@ static void mwrap_dump_destructor(void)
else if (!sscanf(opt, "dump_fd:%d", &dump_fd))
goto out;
- if (!sscanf(opt, "dump_min:%zu", &a.min))
- a.min = 0;
+ if ((s = strstr(opt, "dump_min:")))
+ sscanf(s, "dump_min:%zu", &a.min);
+
+ if ((s = strstr(opt, "dump_heap:")))
+ sscanf(s, "dump_heap:%u", &dump_heap);
switch (dump_fd) {
case 0: goto out;
@@ -1390,7 +1445,9 @@ static void mwrap_dump_destructor(void)
}
/* we'll leak some memory here, but this is a destructor */
}
- dump_to_file(&a);
+ if ((dump_heap & DUMP_HPB_EXCL) == 0)
+ dump_to_file(&a);
+ dump_hpb(a.fp, dump_heap);
out:
--locating;
}
diff --git a/test/test_mwrap.rb b/test/test_mwrap.rb
index 9c6141d..48fba23 100644
--- a/test/test_mwrap.rb
+++ b/test/test_mwrap.rb
@@ -58,6 +58,13 @@ class TestMwrap < Test::Unit::TestCase
res = system(env, *cmd)
assert res, $?.inspect
assert_match(/\b10001\s+1\s+-e:1$/, tmp.read)
+
+ tmp.rewind
+ tmp.truncate(0)
+ env['MWRAP'] = "dump_path:#{tmp.path},dump_heap:5"
+ res = system(env, *cmd)
+ assert res, $?.inspect
+ assert_match %r{lifespan_stddev}, tmp.read
end
end
--
EW
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