CodelTest.cpp File Reference

#include <folly/executors/Codel.h>
#include <folly/portability/GTest.h>
#include <chrono>
#include <thread>

Go to the source code of this file.

Functions
	TEST (CodelTest, Basic)
	TEST (CodelTest, highLoad)
	TEST (CodelTest, mediumLoad)
	TEST (CodelTest, reducingLoad)
	TEST (CodelTest, oneRequestNoDrop)
	TEST (CodelTest, getLoadSanity)

Function Documentation

TEST	(	CodelTest	,
		Basic
	)

Definition at line 25 of file CodelTest.cpp.

References c, EXPECT_FALSE, EXPECT_TRUE, and folly::Codel::overloaded().

                       {
  folly::Codel c;
  std::this_thread::sleep_for(milliseconds(110));
  // This interval is overloaded
  EXPECT_FALSE(c.overloaded(milliseconds(100)));
  std::this_thread::sleep_for(milliseconds(90));
  // At least two requests must happen in an interval before they will fail
  EXPECT_FALSE(c.overloaded(milliseconds(50)));
  EXPECT_TRUE(c.overloaded(milliseconds(50)));
  std::this_thread::sleep_for(milliseconds(110));
  // Previous interval is overloaded, but 2ms isn't enough to fail
  EXPECT_FALSE(c.overloaded(milliseconds(2)));
  std::this_thread::sleep_for(milliseconds(90));
  // 20 ms > target interval * 2
  EXPECT_TRUE(c.overloaded(milliseconds(20)));
}

TEST	(	CodelTest	,
		highLoad
	)

Definition at line 42 of file CodelTest.cpp.

References c, EXPECT_EQ, folly::Codel::getLoad(), and folly::Codel::overloaded().

                          {
  folly::Codel c;
  c.overloaded(milliseconds(40));
  EXPECT_EQ(100, c.getLoad());
}

TEST	(	CodelTest	,
		mediumLoad
	)

Definition at line 48 of file CodelTest.cpp.

References c, EXPECT_FALSE, EXPECT_GT, folly::Codel::getLoad(), and folly::Codel::overloaded().

                            {
  folly::Codel c;
  c.overloaded(milliseconds(20));
  sleep_for(milliseconds(90));
  // this is overloaded but this request shouldn't drop because it's not >
  // slough timeout
  EXPECT_FALSE(c.overloaded(milliseconds(8)));
  EXPECT_GT(100, c.getLoad());
}

TEST	(	CodelTest	,
		reducingLoad
	)

Definition at line 58 of file CodelTest.cpp.

References c, EXPECT_FALSE, and folly::Codel::overloaded().

                              {
  folly::Codel c;
  c.overloaded(milliseconds(20));
  sleep_for(milliseconds(90));
  EXPECT_FALSE(c.overloaded(milliseconds(4)));
}

TEST	(	CodelTest	,
		oneRequestNoDrop
	)

Definition at line 65 of file CodelTest.cpp.

References c, EXPECT_FALSE, and folly::Codel::overloaded().

                                  {
  folly::Codel c;
  EXPECT_FALSE(c.overloaded(milliseconds(20)));
}

TEST	(	CodelTest	,
		getLoadSanity
	)

Definition at line 70 of file CodelTest.cpp.

References c, EXPECT_GT, EXPECT_LT, folly::Codel::getLoad(), and folly::Codel::overloaded().

                               {
  folly::Codel c;
  // should be 100% but leave a litte wiggle room.
  c.overloaded(milliseconds(10));
  EXPECT_LT(99, c.getLoad());
  EXPECT_GT(101, c.getLoad());

  // should be 70% but leave a litte wiggle room.
  c.overloaded(milliseconds(7));
  EXPECT_LT(60, c.getLoad());
  EXPECT_GT(80, c.getLoad());

  // should be 20% but leave a litte wiggle room.
  c.overloaded(milliseconds(2));
  EXPECT_LT(10, c.getLoad());
  EXPECT_GT(30, c.getLoad());

  // this test demonstrates how silly getLoad() is, but silly isn't
  // necessarily useless
}