[omniORB] omniORB transfer sizes.

[FAYOLLE Eric]

HI,

I'm writing to get some additional information about the maximum omniORB transfer sizes.

I noticed that between omiorb 4.2.x and 4.3.0 the management of the giopMaxMsgSize option has been changed internally from type CORBA::ULong to size_t and the value 0 allows to use the maximum size of the system pointer (64bits). I'm trying to test this transfer option using the -ORBgiopMaxMsgSize 0 option which seems to be set correctly.

However, in trying to do some further testing, I've come across several limitations and would like to know which are normal, standard limitations or something potentially configurable at the configuration stage.

It seems that when using a char sequence, because the sequence length mapping is of type CORBA:ULong the sequence size is limited by the 32bit type (uint C on my machine). Is the length of a sequence always limited by a 32bit count? I imagine it is indirectly constrained by the normalized CORBA mapping.

Unless I'm mistaken (and it's quite possible), it seems that when using a double sequence, the limitation no longer comes from the size of the sequence but from the size of the underlying buffer, which also seems to be limited to 32 bits but signed. Indeed, I can transmit 256*1024*1024-1 double (8*256*1024*1024-1 == 0x7fffffff (MAX SIGN INT )) but not one more than that.

Finally, I don't know what to think about the different size limits for sequences and objects?
Could you please clarify this for me.

Thank you.
Eric



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