对限流规则里的线程数有疑问

此处是FlowThreadDemo的关键代码.

Entry methodA = null;

                    try {
                        TimeUnit.MILLISECONDS.sleep(5);
                        methodA = SphU.entry("methodA");
                        activeThread.incrementAndGet();
                        Entry methodB = SphU.entry("methodB");
                        TimeUnit.MILLISECONDS.sleep(methodBRunningTime);
                        methodB.exit();
                        pass.addAndGet(1);
                    } catch (BlockException e1) {
                        block.incrementAndGet();
                    } catch (Exception e2) {
                        // biz exception
                    } finally {
                        total.incrementAndGet();
                        if (methodA != null) {
                            methodA.exit();
                            activeThread.decrementAndGet();
                        }
                    }

private static void initFlowRule() { List rules = new ArrayList(); FlowRule rule1 = new FlowRule(); rule1.setResource("methodA"); // set limit concurrent thread for 'methodA' to 20 rule1.setCount(20); rule1.setGrade(RuleConstant.FLOW_GRADE_THREAD); rule1.setLimitApp("default");

    rules.add(rule1);
    FlowRuleManager.loadRules(rules);
}

以下是打印的日志

我的疑问是这个限流规则 不是说每秒最多20个线程通过吗. ..... 为什么后面当methodBRunningTime时间变短了后 突然一下子通过这么多.....

16 total qps is: 14069 1546419694446, total:14069, pass:801, block:13268 activeThread:21 15 total qps is: 14136 1546419695452, total:14136, pass:809, block:13326 activeThread:19 14 total qps is: 14249 1546419696455, total:14249, pass:808, block:13442 activeThread:20 13 total qps is: 14061 1546419697459, total:14061, pass:794, block:13266 activeThread:20 12 total qps is: 14092

原提问者GitHub用户huihui1112