Blocking on subprocess pipes | PyPA | Page 1

spice gate Jul 16, 2025, 3:04 PM

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While I doubt that is helping, I'm actually surprised iterating over stdout isn't sufficient to keep the subprocess going. I guess a one byte buffer could be jamming something up in a codec somewhere, since the stream is in text mode.

Certainly worth trying the change, since the read is line-buffered anyway, so the small buffer is just going to be increasing interprocess comms overhead without reducing display latency.

jovial cairn Jul 16, 2025, 3:06 PM

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this used to work https://github.com/pypa/hatch/blob/4ebce0e1fe8bf0fcdef587a704c207a063d72575/src/hatch/utils/platform.py#L176-L180

civic yacht Jul 16, 2025, 3:50 PM

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Hmmmm

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I will try to implement your approach

civic yacht Jul 16, 2025, 4:18 PM

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I copied the one from hatch, seems to work well

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I will pray that it fixes issues

jovial cairn Jul 16, 2025, 6:05 PM

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fixed?

civic yacht Jul 17, 2025, 5:15 AM

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No one reported any issues so far

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I couldn't replicate it with or without

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Pushed an update yesterday

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But I can tell that it feels more responsive now, compared to the previous implementation

civic yacht Jul 17, 2025, 5:16 AM

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spice gate While I doubt that is helping, I'm actually surprised iterating over stdout isn'...

So there is some truth to this

civic yacht Jul 17, 2025, 6:21 AM

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Thanks for the help you guys!

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It seems to work, I asked someone who ran into this issue previously and they not only installed it without issue but they also noted it seemed more responsive

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So bufsize was definitely not a great call

#Blocking on subprocess pipes