Py-spy
Dev tools
profiler
SHOW HN2018
286points
43comments
#96of 2,155 in 2018
Top 5%of 2018 by points
How HN took it
LovedMost comments that take a side are positive
9 positive, 10 neutral or asking, 2 mixed, 1 critical, out of 22 comments about the project. Thread score +0.30.
Design: 2 for, 1 againstIdea: 3 for, 0 againstExecution: 2 for, 0 againstPerformance: 2 for, 0 against
The thread, comment by comment
Each row is a top-level comment and its replies, in HN's order. Select a cell to open that comment on HN.
positive neutral or mixed critical about another commenter or something else the maker
What HN said
What people liked
Easy to install and use, works quickly
From 3 comments
Many thanks for building and releasing this. It's ridiculously easy to install (especially in virtualenvs) and very powerful. When I push '3' or '4', I get informative, stable…
hathawsh on HNOh that's great - I had it up and running in 30 seconds.
SketchySeaBeast on HNThis is great! I also took the liberty to add this (and setuptools_rust) to Arch Linux's AUR: https://aur.archlinux.org/packages/python-py-spy
craftyguy on HN
Helped find real performance hotspots
From 1 comment
This is really fantastic. I just managed to find a 3x speedup on a compute heavy job I run using Py-spy - there was an unneeded hotspot in a library I'm using that I didn't…
TTPrograms on HN
Built-in flamegraph and realtime top-style display
From 2 comments
I've been enjoying pyflame from Uber - which the author quotes in their info > The only other Python profiler that runs totally in a separate process is pyflame, which profiles…
lathiat on HNGreat, thanks! And as a slightly different take than that of the person posting the issue - interfaces like kcachegrind are a pretty clunky (if powerful, in their clunky way) -…
pvg on HN
Objections
Requires sudo on macOS
From 2 comments
Gave it a try, and wasn’t expecting to have to execute via sudo on macOS. I almost never use sudo, so this stands out as quite unexpected for a developer tool. Is there something…
bobwaycott on HNhttps://github.com/benfred/py-spy#when-do-you-need-to-run-as-sudo tl;dr - yes, it's a limitation(?) of macOS syscalls.
MetricMike on HN
No multiprocessing support clarity
From 2 comments
Does it support python multiprocessing? Basically nothing out there does that I've found, and it's a really major pain-point for me.
fake-name on HNIt says you pass it a pid, so yes
zzzeek on HN
Requests
Ignore time spent in system calls like poll()
From 2 comments
Many thanks for building and releasing this. It's ridiculously easy to install (especially in virtualenvs) and very powerful. When I push '3' or '4', I get informative, stable…
hathawsh on HNThanks! Both of your suggestions totally make sense. I've created an issue to track the poll() issue here https://github.com/benfred/py-spy/issues/13 - I think that should be an…
benfrederickson on HN
Export output to KCachegrind format
From 2 comments
Wonderful. Can the data it produces be munged into something KCachegrind can show?
pvg on HNNot yet - but I'm hoping to have a version that supports this next week. Will update this issue when it's done: https://github.com/benfred/py-spy/issues/3
benfrederickson on HN
Pause button for copying file paths
From 1 comment
Many thanks for building and releasing this. It's ridiculously easy to install (especially in virtualenvs) and very powerful. When I push '3' or '4', I get informative, stable…
hathawsh on HN
Questions
How to interpret the GIL percentage display
From 2 comments
This is a really great tool - the kind I didn't even know that I needed until I was given it! One question, does anyone here know how to interpret the GIL (Global Interpreter…
jpeanuts on HNWow, it tracks GIL contention? Major feature for me. I use a lot of Numba, and it releases the GIL if you want — so threading is actually useful.
toxik on HN
Whether it supports Python multiprocessing
From 1 comment
Does it support python multiprocessing? Basically nothing out there does that I've found, and it's a really major pain-point for me.
fake-name on HN
Alternatives named
rbspy
From 2 comments
Check out rbspy https://github.com/rbspy/rbspy (rbspy was the inspiration for this project =)
benfrederickson on HNRbspy, the inspiration for this tool, has a similar default output, which you can see in the documentation, https://rbspy.github.io/.
actuallyalys on HN
pyflame
From 1 comment
I've been enjoying pyflame from Uber - which the author quotes in their info > The only other Python profiler that runs totally in a separate process is pyflame, which profiles…
lathiat on HN
yappi
From 1 comment
yappi? https://bitbucket.org/sumerc/yappi/
marmaduke on HN
kernprof
From 1 comment
This is really fantastic. I just managed to find a 3x speedup on a compute heavy job I run using Py-spy - there was an unneeded hotspot in a library I'm using that I didn't…
TTPrograms on HN