Getting abstract error when running node with --perf-basic-prof enabled on Android device via Termux

[SiRumCz]

Here's what I see when I run my script:
$ node --perf-basic-prof index.js .


#
# Fatal error in , line 0
# Check failed: (perf_output_handle_) != nullptr.
#
#
#
#FailureMessage Object: 0x7fff8ac920
----- Native stack trace -----
Trap

I want to profile my nodejs project on android device via Termux, without this flag, simpleperf tool can only show jitted symbols. but I get this error when I run the code.

I tried to define TMPDIR and V8_PERF_BASIC_PROF_DIR, and add --perf-basic-prof-path (I am not sure any of those are a thing, I just followed what I searched online and what GPT tells me) to see if this is permission problem with Termux to access /tmp folder, but no luck.

My device is running:

• Termux 0.119.0-beta.3
• Android 16
• Node version on Termux is v22.20.0
• NPM version is 10.9.3

[devbrett90-prog]

Thanks

[SiRumCz]

Any help or ideas?

[Renegade334]

This error occurs if V8 fails to create the map file, which is almost certainly a filesystem permissions issue on your device. Note that the default value of --perf-basic-prof-path on Android is /data/local/tmp, but you probably need to be pointing this towards a path under the application's own data directory.

[SiRumCz]

This error occurs if V8 fails to create the map file, which is almost certainly a filesystem permissions issue on your device. Note that the default value of --perf-basic-prof-path on Android is /data/local/tmp, but you probably need to be pointing this towards a path under the application's own data directory.

Thanks, I will try this option.

[SiRumCz]

Thanks @Renegade334 it works!

[SiRumCz]

@Renegade334 Hi, sorry to bother again. I am having a problem loading the perf-pid.map files. According to this Doc, it is expecting these perf maps to be under either /data/local/tmp or /tmp, and I copied them to both directories. However, even that, when I run adb shell simpleperf report -i /data/local/tmp/perf.data, I still couldn't get the perf.map files to work.

What I have observed from simpleperf report is that there are lots of unknown symbols with what seems to be symbol address, for example: unknown[+788dcac994]. When I tried to search for this 788dcac994 particular string in all of my perf-pid.map files, no match at all :-(

I also picked an address from one of my perf-pid.map, searched it from simpleperf.data, and got no match either.

Do you have any ideas to resolve this issue? Thanks in advance!

[Renegade334]

At this point, this isn't a Node.js issue – we can't really help with the specifics of using simpleperf with V8. An Android developer community would be your best bet.