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https://sourceware.org/bugzilla/show_bug.cgi?id=25145
Bug ID: 25145
Summary: stap -L 'process("<binary>").statement("*@*:*")' very
slow on aarch64 and power64le machines
Product: systemtap
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: translator
Assignee: systemtap at sourceware dot org
Reporter: wcohen at redhat dot com
Target Milestone: ---
When doing some experiments to see what variables were visible at various
statement lines in a program I found that the following command was MUCH slower
on aarch64 and ppc64le than x86_64. On fc30 x86_64 the following command took
less than 2 minutes to run:
$ time stap -L 'process("./usr/bin/ld").statement("*@*:*")'|wc
71548 1016514 27678760
real 1m20.291s
user 1m11.253s
sys 0m8.840s
On fc30 ppc64le with binaries generated with same options takes almost 20
minutes:
# time stap -L 'process("./usr/bin/ld").statement("*@*:*")'|wc
77651 1170757 30577233
real 19m13.698s
user 19m9.413s
sys 0m4.103s
Did a "perf record -a" and "perf report" for a portion of the run to see where
time was being spent:
# To display the perf.data header info, please use --header/--header-only
options.
#
#
# Total Lost Samples: 0
#
# Samples: 39K of event 'cycles'
# Event count (approx.): 28867284968
#
# Children Self Command Shared Object Symbol
# ........ ........ ............... ........................
.........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
#
98.71% 0.00% stap stap [.]
query_module
|
---query_module
dwarf_query::handle_query_module
dwarf_query::query_module_dwarf
dwflpp::iterate_over_cus<void>
query_cu
dwflpp::iterate_over_srcfile_lines<void>
|
|--96.60%--query_srcfile_line
| |
| |--67.84%--query_statement
| | |
| | --67.84%--dwarf_query::add_probe_point
| | |
| |
|--65.52%--dwarf_query::add_probe_point
| | | |
| | |
--63.80%--dwfl_module_getsym_info
| | | |
| | |
|--11.73%--0x7fff91a029ab
| | | |
|
| | | |
|--10.02%--gelf_getsymshndx
| | | |
|
| | | |
|--0.86%--0x7fff919c9d00
| | | |
|
| | | |
--0.84%--0x7fff919c9d0c
| | | |
| | |
|--11.67%--0x7fff91a02a0b
| | | |
|
| | | |
|--8.89%--gelf_getshdr
| | | |
|
| | | |
|--2.02%--0x7fff919c9ac0
| | | |
|
| | | |
--0.75%--0x7fff919c9acc
| | | |
| | |
|--5.80%--0x7fff91a029ff
| | | |
|
| | | |
--5.79%--elf_getscn
| | | |
| | |
|--4.33%--0x7fff91a02f4b
| | | |
|
| | | |
|--3.17%--0x7fff91a175a3
| | | |
| |
| | | |
| |--1.08%--0x7fff8fe93ae0
| | | |
| |
| | | |
| --0.76%--0x7fff8fe93ae8
| | | |
|
| | | |
--0.59%--0x7fff91a175b0
| | | |
| | |
|--2.41%--0x7fff91a02f78
| | | |
| | |
|--2.24%--0x7fff91a02b18
| | | |
| | |
|--1.58%--0x7fff91a029d4
| | | |
| | |
|--1.37%--0x7fff91a02b14
| | | |
| | |
|--1.32%--0x7fff91a029b8
| | | |
| | |
|--1.28%--0x7fff91a029f4
| | | |
| | |
|--1.13%--0x7fff91a02f3c
| | | |
| | |
|--1.01%--0x7fff91a02a80
| | | |
| | |
|--0.77%--0x7fff91a02f54
| | | |
| | |
|--0.76%--0x7fff91a028fc
| | | |
| | |
--0.59%--0x7fff91a02f4c
| | |
| |
|--1.12%--00000021.plt_call.dwfl_module_getsym_info@@ELFUTILS_0.158
| | |
| |
--1.11%--uprobe_derived_probe::uprobe_derived_probe
| |
dwarf_derived_probe::dwarf_derived_probe
| | |
| |
--0.90%--dwarf_derived_probe::saveargs
| |
| |--25.22%--dwflpp::die_has_pc
| | |
| | --24.94%--dwflpp::die_has_pc
| | |
| | --24.94%--dwarf_haspc
| | |
| |
--23.93%--dwarf_ranges
| | |
| |
|--13.41%--dwarf_highpc
| | |
|
| | |
|--7.17%--dwarf_attr
| | |
| |
| | |
| |--2.90%--0x7fff919cf717
| | |
| | |
| | |
| | |--0.86%--0x7fff919e2248
| | |
| | |
| | |
| | --0.61%--0x7fff919e23a8
| | |
| |
| | |
| |--0.78%--0x7fff919cf734
| | |
| |
| | |
| --0.55%--0x7fff919cf4a4
| | |
|
| | |
|--3.55%--dwarf_lowpc
| | |
| |
| | |
| |--2.19%--dwarf_attr
| | |
| | |
| | |
| | --0.99%--0x7fff919cf717
| | |
| |
| | |
| --0.94%--dwarf_formaddr
| | |
|
| | |
|--0.84%--dwarf_formaddr
| | |
|
| | |
--0.59%--dwarf_formudata
| | |
| |
|--3.44%--dwarf_lowpc
| | |
|
| | |
|--2.33%--dwarf_attr
| | |
| |
| | |
| --1.00%--0x7fff919cf717
| | |
|
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--0.81%--dwarf_formaddr
| | |
| |
--2.14%--dwarf_attr
| |
|
| |
--0.78%--0x7fff919cf717
| |
| --3.23%--dwarf_query::filtered_all
| |
| |--1.96%--std::vector<base_func_info,
std::allocator<base_func_info> >::_M_realloc_insert<base_func_info const&>
| | |
| |
--1.46%--std::vector<base_func_info, std::allocator<base_func_info>
>::_M_realloc_insert<base_func_info const&>
| | |
| |
--1.45%--__memcpy_power7
| |
| --1.19%--dwarf_query::filtered_all
| |
| --0.97%--__memcpy_power7
|
--1.59%--dwflpp::collect_all_lines
|
|--1.03%--dwflpp::get_cu_lines_sorted_by_lineno
| |
| --0.52%--?? (inlined)
|
--0.56%--add_matching_lines_in_func (inlined)
--
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