grpc-gcp-benchmarks/src/benchmarkTest/java/SpannerClientV1TestCases.java [310:327]:
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    List<Long> result = new CopyOnWriteArrayList<>();
    List<Thread> threads = new ArrayList<>();
    if (numOfThreads > 1) {
      for (int t = 0; t < numOfThreads; t++) {
        threads.add(new Thread(() -> func.operate(result)));
      }
    }
    long start = System.currentTimeMillis();
    if (numOfThreads > 1) {
      for (Thread t : threads) {
        t.start();
      }
    } else {
      func.operate(result);
    }

    for (Thread t : threads) {
      t.join();
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grpc-gcp-benchmarks/src/benchmarkTest/java/SpannerTestCases.java [450:467]:
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    List<Long> result = new CopyOnWriteArrayList<>();
    List<Thread> threads = new ArrayList<>();
    if (numOfThreads > 1) {
      for (int t = 0; t < numOfThreads; t++) {
        threads.add(new Thread(() -> func.operate(result)));
      }
    }
    long start = System.currentTimeMillis();
    if (numOfThreads > 1) {
      for (Thread t : threads) {
        t.start();
      }
    } else {
      func.operate(result);
    }

    for (Thread t : threads) {
      t.join();
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