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v8/test/cctest/test-log-utils.cc
mikhail.naganov@gmail.com 3a3a6924a1 Involve more log compression techniques. 
Code addresses are now written as an offset from the previous address for ticks, code move and delete events. Employed backreference and RLE compression for code move and delete events. This gives additional 30% log size reduction for benchmarks run w/o snapshot.

Overall compression results (compared with the revision of V8 having no compression):
 - V8: 70% size reduction for benchmarks run w/o snapshot (for reference, gzip gives 87%)
 - Chromium: 65% size reduction for public html version of benchmarks (v4) (for reference, gzip gives 90%)

The one obvious opportunity for improving compression results in Chromium is to compress URLs of scripts.

Review URL: http://codereview.chromium.org/125114


git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@2162 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2009-06-15 09:37:50 +00:00

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// Copyright 2006-2009 the V8 project authors. All rights reserved.
//
// Tests of logging utilities from log-utils.h
#ifdef ENABLE_LOGGING_AND_PROFILING
#include "v8.h"
#include "log-utils.h"
#include "cctest.h"
using v8::internal::CStrVector;
using v8::internal::EmbeddedVector;
using v8::internal::LogDynamicBuffer;
using v8::internal::LogRecordCompressor;
using v8::internal::MutableCStrVector;
using v8::internal::ScopedVector;
using v8::internal::Vector;
// Fills 'ref_buffer' with test data: a sequence of two-digit
// hex numbers: '0001020304...'. Then writes 'ref_buffer' contents to 'dynabuf'.
static void WriteData(LogDynamicBuffer* dynabuf, Vector<char>* ref_buffer) {
static const char kHex[] = "0123456789ABCDEF";
CHECK_GT(ref_buffer->length(), 0);
CHECK_GT(513, ref_buffer->length());
for (int i = 0, half_len = ref_buffer->length() >> 1; i < half_len; ++i) {
(*ref_buffer)[i << 1] = kHex[i >> 4];
(*ref_buffer)[(i << 1) + 1] = kHex[i & 15];
}
if (ref_buffer->length() & 1) {
ref_buffer->last() = kHex[ref_buffer->length() >> 5];
}
CHECK_EQ(ref_buffer->length(),
dynabuf->Write(ref_buffer->start(), ref_buffer->length()));
}
static int ReadData(
LogDynamicBuffer* dynabuf, int start_pos, i::Vector<char>* buffer) {
return dynabuf->Read(start_pos, buffer->start(), buffer->length());
}
// Helper function used by CHECK_EQ to compare Vectors. Templatized to
// accept both "char" and "const char" vector contents.
template <typename E, typename V>
static inline void CheckEqualsHelper(const char* file, int line,
const char* expected_source,
const Vector<E>& expected,
const char* value_source,
const Vector<V>& value) {
if (expected.length() != value.length()) {
V8_Fatal(file, line, "CHECK_EQ(%s, %s) failed\n"
"# Vectors lengths differ: %d expected, %d found\n"
"# Expected: %.*s\n"
"# Found: %.*s",
expected_source, value_source,
expected.length(), value.length(),
expected.length(), expected.start(),
value.length(), value.start());
}
if (strncmp(expected.start(), value.start(), expected.length()) != 0) {
V8_Fatal(file, line, "CHECK_EQ(%s, %s) failed\n"
"# Vectors contents differ:\n"
"# Expected: %.*s\n"
"# Found: %.*s",
expected_source, value_source,
expected.length(), expected.start(),
value.length(), value.start());
}
}
TEST(DynaBufSingleBlock) {
LogDynamicBuffer dynabuf(32, 32, "", 0);
EmbeddedVector<char, 32> ref_buf;
WriteData(&dynabuf, &ref_buf);
EmbeddedVector<char, 32> buf;
CHECK_EQ(32, dynabuf.Read(0, buf.start(), buf.length()));
CHECK_EQ(32, ReadData(&dynabuf, 0, &buf));
CHECK_EQ(ref_buf, buf);
// Verify that we can't read and write past the end.
CHECK_EQ(0, dynabuf.Read(32, buf.start(), buf.length()));
CHECK_EQ(0, dynabuf.Write(buf.start(), buf.length()));
}
TEST(DynaBufCrossBlocks) {
LogDynamicBuffer dynabuf(32, 128, "", 0);
EmbeddedVector<char, 48> ref_buf;
WriteData(&dynabuf, &ref_buf);
CHECK_EQ(48, dynabuf.Write(ref_buf.start(), ref_buf.length()));
// Verify that we can't write data when remaining buffer space isn't enough.
CHECK_EQ(0, dynabuf.Write(ref_buf.start(), ref_buf.length()));
EmbeddedVector<char, 48> buf;
CHECK_EQ(48, ReadData(&dynabuf, 0, &buf));
CHECK_EQ(ref_buf, buf);
CHECK_EQ(48, ReadData(&dynabuf, 48, &buf));
CHECK_EQ(ref_buf, buf);
CHECK_EQ(0, ReadData(&dynabuf, 48 * 2, &buf));
}
TEST(DynaBufReadTruncation) {
LogDynamicBuffer dynabuf(32, 128, "", 0);
EmbeddedVector<char, 128> ref_buf;
WriteData(&dynabuf, &ref_buf);
EmbeddedVector<char, 128> buf;
CHECK_EQ(128, ReadData(&dynabuf, 0, &buf));
CHECK_EQ(ref_buf, buf);
// Try to read near the end with a buffer larger than remaining data size.
EmbeddedVector<char, 48> tail_buf;
CHECK_EQ(32, ReadData(&dynabuf, 128 - 32, &tail_buf));
CHECK_EQ(ref_buf.SubVector(128 - 32, 128), tail_buf.SubVector(0, 32));
}
TEST(DynaBufSealing) {
const char* seal = "Sealed";
const int seal_size = strlen(seal);
LogDynamicBuffer dynabuf(32, 128, seal, seal_size);
EmbeddedVector<char, 100> ref_buf;
WriteData(&dynabuf, &ref_buf);
// Try to write data that will not fit in the buffer.
CHECK_EQ(0, dynabuf.Write(ref_buf.start(), 128 - 100 - seal_size + 1));
// Now the buffer is sealed, writing of any amount of data is forbidden.
CHECK_EQ(0, dynabuf.Write(ref_buf.start(), 1));
EmbeddedVector<char, 100> buf;
CHECK_EQ(100, ReadData(&dynabuf, 0, &buf));
CHECK_EQ(ref_buf, buf);
// Check the seal.
EmbeddedVector<char, 50> seal_buf;
CHECK_EQ(seal_size, ReadData(&dynabuf, 100, &seal_buf));
CHECK_EQ(CStrVector(seal), seal_buf.SubVector(0, seal_size));
// Verify that there's no data beyond the seal.
CHECK_EQ(0, ReadData(&dynabuf, 100 + seal_size, &buf));
}
TEST(CompressorStore) {
LogRecordCompressor comp(2);
const Vector<const char> empty = CStrVector("");
CHECK(comp.Store(empty));
CHECK(!comp.Store(empty));
CHECK(!comp.Store(empty));
const Vector<const char> aaa = CStrVector("aaa");
CHECK(comp.Store(aaa));
CHECK(!comp.Store(aaa));
CHECK(!comp.Store(aaa));
CHECK(comp.Store(empty));
CHECK(!comp.Store(empty));
CHECK(!comp.Store(empty));
}
void CheckCompression(LogRecordCompressor* comp,
const Vector<const char>& after) {
EmbeddedVector<char, 100> result;
CHECK(comp->RetrievePreviousCompressed(&result));
CHECK_EQ(after, result);
}
void CheckCompression(LogRecordCompressor* comp,
const char* after) {
CheckCompression(comp, CStrVector(after));
}
TEST(CompressorNonCompressed) {
LogRecordCompressor comp(0);
CHECK(!comp.RetrievePreviousCompressed(NULL));
const Vector<const char> empty = CStrVector("");
CHECK(comp.Store(empty));
CHECK(!comp.RetrievePreviousCompressed(NULL));
const Vector<const char> a_x_20 = CStrVector("aaaaaaaaaaaaaaaaaaaa");
CHECK(comp.Store(a_x_20));
CheckCompression(&comp, empty);
CheckCompression(&comp, empty);
CHECK(comp.Store(empty));
CheckCompression(&comp, a_x_20);
CheckCompression(&comp, a_x_20);
}
TEST(CompressorSingleLine) {
LogRecordCompressor comp(1);
const Vector<const char> string_1 = CStrVector("eee,ddd,ccc,bbb,aaa");
CHECK(comp.Store(string_1));
const Vector<const char> string_2 = CStrVector("fff,ddd,ccc,bbb,aaa");
CHECK(comp.Store(string_2));
// string_1 hasn't been compressed.
CheckCompression(&comp, string_1);
CheckCompression(&comp, string_1);
const Vector<const char> string_3 = CStrVector("hhh,ggg,ccc,bbb,aaa");
CHECK(comp.Store(string_3));
// string_2 compressed using string_1.
CheckCompression(&comp, "fff#1:3");
CheckCompression(&comp, "fff#1:3");
CHECK(!comp.Store(string_3));
// Expecting no changes.
CheckCompression(&comp, "fff#1:3");
CHECK(!comp.Store(string_3));
// Expecting no changes.
CheckCompression(&comp, "fff#1:3");
const Vector<const char> string_4 = CStrVector("iii,hhh,ggg,ccc,bbb,aaa");
CHECK(comp.Store(string_4));
// string_3 compressed using string_2.
CheckCompression(&comp, "hhh,ggg#1:7");
const Vector<const char> string_5 = CStrVector("nnn,mmm,lll,kkk,jjj");
CHECK(comp.Store(string_5));
// string_4 compressed using string_3.
CheckCompression(&comp, "iii,#1");
const Vector<const char> string_6 = CStrVector("nnn,mmmmmm,lll,kkk,jjj");
CHECK(comp.Store(string_6));
// string_5 hasn't been compressed.
CheckCompression(&comp, string_5);
CHECK(comp.Store(string_5));
// string_6 compressed using string_5.
CheckCompression(&comp, "nnn,mmm#1:4");
const Vector<const char> string_7 = CStrVector("nnnnnn,mmm,lll,kkk,jjj");
CHECK(comp.Store(string_7));
// string_5 compressed using string_6.
CheckCompression(&comp, "nnn,#1:7");
const Vector<const char> string_8 = CStrVector("xxn,mmm,lll,kkk,jjj");
CHECK(comp.Store(string_8));
// string_7 compressed using string_5.
CheckCompression(&comp, "nnn#1");
const Vector<const char> string_9 =
CStrVector("aaaaaaaaaaaaa,bbbbbbbbbbbbbbbbb");
CHECK(comp.Store(string_9));
// string_8 compressed using string_7.
CheckCompression(&comp, "xx#1:5");
const Vector<const char> string_10 =
CStrVector("aaaaaaaaaaaaa,cccccccbbbbbbbbbb");
CHECK(comp.Store(string_10));
// string_9 hasn't been compressed.
CheckCompression(&comp, string_9);
CHECK(comp.Store(string_1));
// string_10 compressed using string_9.
CheckCompression(&comp, "aaaaaaaaaaaaa,ccccccc#1:21");
}
TEST(CompressorMultiLines) {
const int kWindowSize = 3;
LogRecordCompressor comp(kWindowSize);
const Vector<const char> string_1 = CStrVector("eee,ddd,ccc,bbb,aaa");
CHECK(comp.Store(string_1));
const Vector<const char> string_2 = CStrVector("iii,hhh,ggg,fff,aaa");
CHECK(comp.Store(string_2));
const Vector<const char> string_3 = CStrVector("mmm,lll,kkk,jjj,aaa");
CHECK(comp.Store(string_3));
const Vector<const char> string_4 = CStrVector("nnn,hhh,ggg,fff,aaa");
CHECK(comp.Store(string_4));
const Vector<const char> string_5 = CStrVector("ooo,lll,kkk,jjj,aaa");
CHECK(comp.Store(string_5));
// string_4 compressed using string_2.
CheckCompression(&comp, "nnn#2:3");
CHECK(comp.Store(string_1));
// string_5 compressed using string_3.
CheckCompression(&comp, "ooo#2:3");
CHECK(comp.Store(string_4));
// string_1 is out of buffer by now, so it shouldn't be compressed.
CHECK_GE(3, kWindowSize);
CheckCompression(&comp, string_1);
CHECK(comp.Store(string_2));
// string_4 compressed using itself.
CheckCompression(&comp, "#3");
}
TEST(CompressorBestSelection) {
LogRecordCompressor comp(3);
const Vector<const char> string_1 = CStrVector("eee,ddd,ccc,bbb,aaa");
CHECK(comp.Store(string_1));
const Vector<const char> string_2 = CStrVector("ddd,ccc,bbb,aaa");
CHECK(comp.Store(string_2));
const Vector<const char> string_3 = CStrVector("fff,eee,ddd,ccc,bbb,aaa");
CHECK(comp.Store(string_3));
// string_2 compressed using string_1.
CheckCompression(&comp, "#1:4");
const Vector<const char> string_4 = CStrVector("nnn,hhh,ggg,fff,aaa");
CHECK(comp.Store(string_4));
// Compressing string_3 using string_1 gives a better compression than
// using string_2.
CheckCompression(&comp, "fff,#2");
}
TEST(CompressorCompressibility) {
LogRecordCompressor comp(2);
const Vector<const char> string_1 = CStrVector("eee,ddd,ccc,bbb,aaa");
CHECK(comp.Store(string_1));
const Vector<const char> string_2 = CStrVector("ccc,bbb,aaa");
CHECK(comp.Store(string_2));
const Vector<const char> string_3 = CStrVector("aaa");
CHECK(comp.Store(string_3));
// string_2 compressed using string_1.
CheckCompression(&comp, "#1:8");
const Vector<const char> string_4 = CStrVector("xxx");
CHECK(comp.Store(string_4));
// string_3 can't be compressed using string_2 --- too short.
CheckCompression(&comp, string_3);
}
#endif // ENABLE_LOGGING_AND_PROFILING
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