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src: speed up module loading #9132

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merged 2 commits into from
Oct 24, 2016
Merged

src: speed up module loading #9132

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35e8896
src: speed up module loading, skip EOF read
bnoordhuis Oct 17, 2016
d52f5dc
src: speed up module loading, don't resize buffer
bnoordhuis Oct 17, 2016
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20 changes: 7 additions & 13 deletions src/node_file.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -546,10 +546,11 @@ static void InternalModuleReadFile(const FunctionCallbackInfo<Value>& args) {
return;
}

const size_t kBlockSize = 32 << 10;
std::vector<char> chars;
int64_t offset = 0;
for (;;) {
const size_t kBlockSize = 32 << 10;
ssize_t numchars;
do {
const size_t start = chars.size();
chars.resize(start + kBlockSize);

Expand All @@ -558,34 +559,27 @@ static void InternalModuleReadFile(const FunctionCallbackInfo<Value>& args) {
buf.len = kBlockSize;

uv_fs_t read_req;
const ssize_t numchars =
uv_fs_read(loop, &read_req, fd, &buf, 1, offset, nullptr);
numchars = uv_fs_read(loop, &read_req, fd, &buf, 1, offset, nullptr);
uv_fs_req_cleanup(&read_req);

CHECK_GE(numchars, 0);
if (static_cast<size_t>(numchars) < kBlockSize) {
chars.resize(start + numchars);
}
if (numchars == 0) {
break;
}
offset += numchars;
}
} while (static_cast<size_t>(numchars) == kBlockSize);

uv_fs_t close_req;
CHECK_EQ(0, uv_fs_close(loop, &close_req, fd, nullptr));
uv_fs_req_cleanup(&close_req);

size_t start = 0;
if (chars.size() >= 3 && 0 == memcmp(&chars[0], "\xEF\xBB\xBF", 3)) {
if (offset >= 3 && 0 == memcmp(&chars[0], "\xEF\xBB\xBF", 3)) {
start = 3; // Skip UTF-8 BOM.
}

Local<String> chars_string =
String::NewFromUtf8(env->isolate(),
&chars[start],
String::kNormalString,
chars.size() - start);
offset - start);
args.GetReturnValue().Set(chars_string);
}

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