Re: [Quickfix-developers] Fast message cloning, toString() setString()?

[Dale W. <wi...@oc...>]

  Hi Wil,
I know you asked about C#.  Let me answer the question for C++ and see 
if that helps.

By FAR the fastest way to clone a message in C++ is:
    FIX::Message newMessage(originalMessage);

that is to use the copy constructor to initialize an auto variable.  
Note that there is no need to render the object into a string; no need 
for a data dictionary; and in C++ no need for heap allocation of the 
message object itself (allocation consists of bumping the stack pointer 
by sizeof(Message).   Some of the contents may require heap allocation, 
but there's not a good, safe way around that.

The equivalent code in C#

    FIX.Message newMessage = new FIX.Message(originalMessage);

does require a heap allocation -- but then EVERYTHING in C# requires a 
heap allocation [yes, I know I'm exaggerating] so the .NET heap 
allocator/garbage collector is highly optimized to make this as painless 
as possible.    Notice that in your technique of rendering the message 
to string then parsing the string into a new message you are using a 
heap allocated string!

If I were writing the code and performance was critical, I'd go with the 
above technique then profile the code to see if more arcane techniques 
were indicated.   If they were, I would be very sure to profile the 
results to be sure that any optimization I came up with didn't slow the 
system down too badly (grin)

Dale






On 10/4/2010 12:15 PM, Wilhelm Thomas wrote:
> QuickFIX Documentation: http://www.quickfixengine.org/quickfix/doc/html/index.html
> QuickFIX Support: http://www.quickfixengine.org/services.html
>
>
>
> Hello, I'm using c#
> I'm basically trying to clone super fast a message without having the 
> need to create a new Message everytime but just feeding the new string 
> via setString.
> Unfortunatly string msg = message.Tostring() doesn't seem to output 
> the tag in the right order, so I can not do
> another_message.setstring(@msg)
> What is the fastest way to get the string out from a Message object so 
> I can feed an empty Message object?
> Any other idea for a super fast cloning not involving the creation of 
> too many objects?
> thanks for your help
> Wil
>
>
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