Mechanism for optimized intra-die inter-nodelet messaging communication

A system for intra-die inter-nodelet messaging communication, comprising:

• a plurality of nodelets on a single chip, each of the nodelets having its own memory coherence domain that is not shared with the rest of the nodelets on the single chip, each nodelet comprising one or more process cores, wherein the plurality of nodelets comprise at least a first nodelet having a first process core and a first memory coherence domain, and a second nodelet having a second process core and a second memory coherence domain;
• a bucket comprising a memory array and hardware control logic that supports message passing interface semantics, for communicating data across the plurality of nodelets, wherein the bucket is not part of the memory coherence domains of the nodelets, wherein
• the first process core is enabled to map the bucket to the first process core as part of address space of the first process, write message data to the bucket and invoke a send message passing interface function that raises a hardware signal to the second process core, the hardware signal that is raised triggering the second process to invoke a receive message passing interface function and wherein in response to the second process core invoking the receive message passing interface function, the bucket is mapped to a memory space of the second process core for enabling the second process core to read the data,
• wherein after the first process invokes the send message passing interface function, the message data in the bucket cannot be modified from the first process.

A computer readable storage medium, excluding a signal per se, storing a code of instructions executable by a machine to perform a method of intra-die inter-nodelet messaging communication, the method comprising:

• allocating a bucket comprising a memory array and hardware control logic that supports message passing interface semantics, for communicating data between a first process on a first memory domain and a second process on a second memory domain, wherein the first memory domain and the second memory domain are not shared, and wherein the bucket is not part of memory coherence domains of the first process and the second process;
• mapping the bucket to the first process as part of address space of the first process;
• writing, by the first process, message data to the bucket and invoking a send message passing interface function that raises a hardware signal to the second process;
• and mapping the bucket to a memory space of the second process in response to the second process invoking a receive message passing interface function, the hardware signal that is raised triggering the second process to invoke the receive message passing interface function, wherein the second process is enabled to read the data in the mapped bucket,
• wherein after the first process invokes the send message passing interface function, the message data in the bucket cannot be modified from the first process.

A method for intra-die inter-nodelet messaging communication, comprising:

• reserving a bucket comprising a memory array and hardware control logic that supports message passing interface semantics, for communicating data between a first process on a first memory domain and a second process on a second memory domain, wherein the first memory domain and the second memory domain are not shared, and wherein the bucket is not part of memory coherence domains of the first process and the second process;
• setting a plurality of control bits to indicate exclusive read and write access for the first process only;
• receiving a send call invoked by the first process;
• setting the control bits to indicate shared read and write access for the first process and raising a hardware signal for the second process in response to receiving the send call;
• receiving a receive call invoked by the second process;
• setting the control bits to indicate shared read and write access for the second process in response to receiving the receive call;
• in response to receiving an un-map call from the first process, setting the control bits to indicate exclusive read and write access for the second process;
• and
• in response to receiving an un-map call from the second process, setting the control bits to indicate exclusive read and write access for the first process.