Hi Jakob,
One interesting point to me here. You mention in "3.32 was just a random
daily snapshot". What kind of objects will be included in the snapshot?
I am also doing the upgrade from 3.25 to 4.5. For my application, I need to
replace all original "Error Object" with my customized one (doing in
JavaScript space, not C++).
In 3.25 version, it worked ok. However, after upgrading to 4.5, it is not
working any more! I found turning "snapshot=off" solved this problem. Based
on the observation, I think the default snapshot in 4.5 contains "Error
Object", while in old version (3.25), "Error Object" is not included in the
random snapshot? Is my guess right? Could you help point out where I can
"customize" the snapshot? (Currently I turn off snapshot, and I'm afraid I
have performance issue, sign...). Thanks.
On Saturday, November 21, 2015 at 7:26:15 PM UTC+8, Jakob Kummerow wrote:
>
> The purpose of the snapshot is to speed up Isolate and Context creation.
> If you build with snapshot=off, startup will be slower.
>
> (Also, I'm really glad you're moving away from version 3.32.3, which was
> just a random daily snapshot, not suitable for production use.)
>
> On Sat, Nov 21, 2015 at 2:34 AM, Nick Sorrentino <ni...@metavine.com
> <javascript:>> wrote:
>
>> We recently updated our version of V8 from 3.32.3 to 4.5.103.35. We are
>> seeing a major performance impact on Isolate and Context creation.
>>
>> In version 4.1 we were seeing times around 6ms and on 4.5 we are seeings
>> times around 45ms. The code we are benching marking is below. Any
>> guidance here?
>>
>>
>> // Initialise the isolate create parameters
>>
>> Utility::ArrayBufferAllocator allocator;
>>
>> v8::Isolate::CreateParams create_params;
>>
>> create_params.array_buffer_allocator = &allocator;
>>
>>
>>
>> // Create a v8 isolate object
>>
>> v8::Isolate* pIsolate = v8::Isolate::New( create_params );
>>
>>
>>
>> // Execute the script
>>
>> {
>>
>> // Lock the v8 isolate object
>>
>> v8::Locker oLocker( pIsolate );
>>
>>
>>
>> // Create a scope for the v8 isolate object
>>
>> v8::Isolate::Scope oIsolateScope( pIsolate );
>>
>>
>>
>> // Create a handle scope
>>
>> v8::HandleScope oHandleScope( pIsolate );
>>
>>
>>
>> // Create a template for the global object where we set the
>> built-in global functions.
>>
>> v8::Handle<v8::ObjectTemplate> global = v8::ObjectTemplate::New(
>> pIsolate );
>>
>>
>>
>> // Bind the functions to the global object template
>>
>> global->Set( v8::String::NewFromUtf8( pIsolate, u8
>> "VEUnconfigureAnchorContext" ), v8::FunctionTemplate::New( pIsolate,
>> LocalUnconfigureAnchorContext, v8::External::New( pIsolate,
>> m_pScriptObject ) ) );
>> //more methods added here (~200)
>>
>> // Create a new context based on the global object template
>>
>> v8::Handle<v8::Context> oContext = v8::Context::New( pIsolate,
>> NULL, global );
>>
>> }
>>
>>
>> How We are making version 3.32
>> make library=shared soname_version=3.32.3 i18nsupport=off
>> OUTDIR=../$(DEPS_BUILD_BASE_DIR)v8 x64.release
>>
>> How We are making version 4.5
>>
>> make library=shared soname_version=4.5.103 i18nsupport=off snapshot=off
>> OUTDIR=../$(DEPS_BUILD_BASE_DIR)v8 x64.release
>>
>>
>>
>> Any advice our guidance would be greatly appreciated.
>>
>> --
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>
>
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