International Business Machines Corporation

Sertac Cakici

Benjiman L Goodman

Madeline Vega

Samuel I Ward

Meghna Paruthi

John Farrugia

Linton B Ward, Jr

Ryan M McBeth

A method for tracing thread bus transactions in a multiprocessor system comprises decoding, by a processor, a first thread instruction of a thread, the thread comprising an ordered series of thread instructions. In the event the first thread instruction is a set bus trace enable bit (BTEB) instruction, the processor sets a bus trace enable bit corresponding to the thread. In the event the BTEB is set, the processor determines whether the first thread instruction is a trace-eligible instruction and, in the event the first thread instruction is a trace-eligible instruction, and the BTEB is set, the processor sets a snoop tag trace enable bit (STTEB). A hardware trace monitor (HTM) monitors bus transactions, each bus transaction comprising a STTE. In the event a monitored bus transaction comprises a set STTEB, the HTM stores the bus transaction as trace data. In the event a monitored bus transaction comprises a reset STTEB, the HTM does not store the bus transaction as trace data.

Hardware process trace facility

A modular computing housing includes a housing structure having a plurality of component slots that each can receive one of a plurality of components, where at least one of the components includes a processor having an operating frequency. A cooling system provides airflow through each of the component slots. A thermal control system can be communicably connected to each of the component slots and each of the received component processors. The thermal control system receives configuration data from each of the component slots, retrieves throttle data corresponding to the configuration data, and directs at least one received component processors to reduce its operating frequency in accordance with the throttle data.

Preemptive thermal control by processor throttling in a modular computing system

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Austin, TX, United States of America

Sertac Cakici