Warn if PostgreSQL appears stalled

Dependencies

• [2] 73YR46NJ hydra-queue-runner: Write directly to a binary cache
• [*] MHVIT4JY Split hydra-queue-runner.cc more
• [*] 7LB6QBXY Keep track of the number of build steps that are being built
• [*] EYR3EW6J Keep stats for the Hydra auto scaler
• [*] 24BMQDZA Start of single-process hydra-queue-runner
• [*] 5AIYUMTB Basic remote building
• [*] PLOZBRTR Add command ‘hydra-queue-runner --status’ to show current status
• [*] RQUAATWB Add status dump facility
• [*] VQISTKOP hydra-queue-runner: Use substitutes
• [*] HJOEIMLR Refactor

Change contents

• edit in src/hydra-queue-runner/builder.cc at line 115
  [4.3995]

  [4.3995]
  + auto mc = startDbUpdate();
• edit in src/hydra-queue-runner/builder.cc at line 169
  [4.5501]

  [4.5501]
  + auto mc = startDbUpdate();
• edit in src/hydra-queue-runner/builder.cc at line 218
  [4.7316]

  [4.7316]
  + auto mc = startDbUpdate();

  +
• edit in src/hydra-queue-runner/builder.cc at line 306
  [4.10359]

  [4.10359]
  + auto mc = startDbUpdate();

  +
• edit in src/hydra-queue-runner/counter.hh at line 4
  [5.267]

  [5.267]
  + #include <functional>
• edit in src/hydra-queue-runner/counter.hh at line 12
  [5.399]

  [6.234]
  + MaintainCount(counter & c, std::function<void(unsigned long)> warn) : c(c)

  + {

  + warn(++c);

  + }
• edit in src/hydra-queue-runner/hydra-queue-runner.cc at line 45
  [8.7892]

  [2.1542]
  + }

  +

  +

  + MaintainCount State::startDbUpdate()

  + {

  + return MaintainCount(nrActiveDbUpdates, [](unsigned long c) {

  + if (c > 6) {

  + printMsg(lvlError, format("warning: %d concurrent database updates; PostgreSQL may be stalled") % c);

  + }

  + });
• edit in src/hydra-queue-runner/hydra-queue-runner.cc at line 565
  [9.1628]

  [9.1628]
  + root.attr("nrActiveDbUpdates", nrActiveDbUpdates);
• edit in src/hydra-queue-runner/hydra-queue-runner.cc at line 675
  [10.413]

  [9.2019]
  + auto mc = startDbUpdate();
• edit in src/hydra-queue-runner/queue-monitor.cc at line 127
  [4.23372]

  [4.23372]
  + auto mc = startDbUpdate();
• edit in src/hydra-queue-runner/queue-monitor.cc at line 165
  [4.24983]

  [4.24983]
  + {

  + auto mc = startDbUpdate();
• edit in src/hydra-queue-runner/queue-monitor.cc at line 171
  [4.25142]

  [4.25142]
  + }
• edit in src/hydra-queue-runner/queue-monitor.cc at line 185
  [4.26530]

  [4.26530]
  + auto mc = startDbUpdate();
• edit in src/hydra-queue-runner/queue-monitor.cc at line 429
  [11.2615]

  [11.2615]
  + auto mc = startDbUpdate();
• edit in src/hydra-queue-runner/state.hh at line 316
  [12.6084]

  [12.6084]
  + counter nrActiveDbUpdates{0};
• edit in src/hydra-queue-runner/state.hh at line 363
  [2.13176]

  [2.13176]
  + MaintainCount startDbUpdate();

  +