Comment # 1
on bug 12955
from Peter Wu
After only a few (2-3) suspend cycles I noticed an increased CPU usage.
Attaching a debugger shows 308 interfaces:
$ gdb -q -p `pidof wireshark` -ex b\ InterfaceTree::updateStatistics -ex c
...
Thread 1 "wireshark" hit Breakpoint 1, InterfaceTree::updateStatistics
(this=0x6060001003a0)
at /tmp/wireshark/ui/qt/interface_tree.cpp:316
316 if (!stat_cache_) {
(gdb) next
321 if (!stat_cache_) return;
(gdb)
323 QTreeWidgetItemIterator iter(this);
(gdb)
324 while (*iter) {
(gdb)
327 for (if_idx = 0; if_idx < global_capture_opts.all_ifaces->len;
if_idx++) {
(gdb) p global_capture_opts.all_ifaces->len
$1 = 308
This Wireshark binary is ASAN-instrumented and runs with
LSAN_OPTIONS=fast_unwind_on_malloc=0 set, this slows malloc a lot which can be
seen in the perf trace (percentages are accounting cycles):
98% InterfaceTree::updateStatistics
+ 50% QString constructor
+ 48% __sanitizer::BufferedStackTrace::SlowUnwindStack
+ 42% ~QString
+ 41% __sanitizer::BufferedStackTrace::SlowUnwindStack
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