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Merge bitcoin/bitcoin#33485: test: set par=2 in default config for functional test framework

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dda5228e02ca6a839bf87ae7dbd133547563816a test: set par=2 in default config for functional test framework (Andrew Toth)

Pull request description:

  Depending on the host machine, a default `par` value can spawn up to 15 script verification threads for each node. Running the functional test suite with default `par` can exhaust file descriptors or hit other resource limits when many threads are spawned. These threads are mostly idle and the same code paths are executed with a value of `par=2`. Limit this to 2 for functional tests that do not override the default option.

ACKs for top commit:
  maflcko:
    lgtm ACK dda5228e02ca6a839bf87ae7dbd133547563816a
  pablomartin4btc:
    ACK dda5228e02ca6a839bf87ae7dbd133547563816a
  l0rinc:
    Code review ACK dda5228e02ca6a839bf87ae7dbd133547563816a
  theStack:
    ACK dda5228e02ca6a839bf87ae7dbd133547563816a

Tree-SHA512: 4459972330ff50ac7391141db6382579de09d84e68959eaeb5f20972bb9daf9aac1bd68355028ded9ee65e838c12dbd53e6f3bb6cdc375d269f666c19a19eaec
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merge-script 2025-10-03 22:36:34 +01:00
commit 2578da69f4
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test/functional/test_framework/util.py
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@ -474,6 +474,7 @@ def write_config(config_path, *, n, chain, extra_config="", disable_autoconnect=
# min_required_fds = MIN_CORE_FDS + MAX_ADDNODE_CONNECTIONS + nBind = 151 + 8 + 3 = 162;
# nMaxConnections = available_fds - min_required_fds = 256 - 161 = 94;
f.write("maxconnections=94\n")
f.write("par=" + str(min(2, os.cpu_count())) + "\n")
f.write(extra_config)