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My understanding of Playwright is that it's trying to be the new Selenium, in that it's a programming language orchestrating the WebDriver protocol That means

My understanding of Playwright is that it's trying to be the new Selenium, in that it's a programming language orchestrating the WebDriver protocol That means that if you are running against Chromium, this will likely work, but unless Firefox has a similar heapdump function, it is unlikely to work[1]. And almost certainly not Safari, based on my experience. All of that is also qualified by whether Playwright exposes that behavior, or otherwise allows one to "get into the weeds" to invoke the function under the hood 1 = as an update, I checked and Firefox does have a memory snapshot feature, but the file it saved is some kind of binary encoded thing without any obvious strings in it I didn't see any such thing in Safari

asabla 5y ago
Well kind of for Firefox, there is this profiling tool which you could use (semi-built in) https://github.com/firefox-devtools/profiler https://github.com/firefox-devtools/profiler. Which let you save a report in json.gz format
nmstoker 5y ago
I had understood that Playwright actually used the DevTools protocol rather than the WebDriver protocol, as mentioned here: https://github.com/microsoft/playwright/issues/4862 https://github.com/microsoft/playwright/issues/4862 And there's a bit of detail about how they're different here: https://stackoverflow.com/q/50939116/142780 https://stackoverflow.com/q/50939116/142780 However that's more a detail and doesn't really undermine your point about Firefox / Safari being handled differently, it's just that Playwright implemented their own versions of the protocol for those two non-Chromium based browsers
nousermane 5y ago
> Firefox does have a memory snapshot feature, but the file it saved is some kind of binary encoded thing without any obvious strings in it Those .fxsnapshot files are gzipped binary heaps. There is a 3rd-party decoder for it: https://github.com/jimblandy/fxsnapshot https://github.com/jimblandy/fxsnapshot

asabla 5y ago

Well kind of for Firefox, there is this profiling tool which you could use (semi-built in) https://github.com/firefox-devtools/profiler https://github.com/firefox-devtools/profiler. Which let you save a report in json.gz format

nmstoker 5y ago

I had understood that Playwright actually used the DevTools protocol rather than the WebDriver protocol, as mentioned here: https://github.com/microsoft/playwright/issues/4862 https://github.com/microsoft/playwright/issues/4862 And there's a bit of detail about how they're different here: https://stackoverflow.com/q/50939116/142780 https://stackoverflow.com/q/50939116/142780 However that's more a detail and doesn't really undermine your point about Firefox / Safari being handled differently, it's just that Playwright implemented their own versions of the protocol for those two non-Chromium based browsers

nousermane 5y ago

> Firefox does have a memory snapshot feature, but the file it saved is some kind of binary encoded thing without any obvious strings in it Those .fxsnapshot files are gzipped binary heaps. There is a 3rd-party decoder for it: https://github.com/jimblandy/fxsnapshot https://github.com/jimblandy/fxsnapshot