ACCEL Flag Description
Lenovo Global Technology ThinkSystem SR655

Base Compiler Invocation

C benchmarks

C++ benchmarks

Base Portability Flags



Base Optimization Flags

C benchmarks

C++ benchmarks

Base Other Flags

C benchmarks

C++ benchmarks

Implicitly Included Flags

This section contains descriptions of flags that were included implicitly by other flags, but which do not have a permanent home at SPEC.

Shell, Environment, and Other Software Settings

AMD BIOS settings

Maximum Performance

maximizes performance and minimizes latency with little regard to power consumption

SMT Mode

Can be used to disable symmetric multithreading. To re-enable SMT, a POWER CYCLE is needed after selecting the 'Auto' option. WARNING - S3 is NOT SUPPORTED on systems where SMT is disabled.

Specifies the number of desired NUMA nodes per socket. Zero will attempt to interleave the two sockets together.

Machine Configurations

BIOS settings

Maximum Performance

Mode will maximize the absolute performance of the system without regard for power. In this mode, power consumption is a don't care. Things like fan speed and heat output of the system may increase in addition to power consumption. Efficiency of the system may go down in this mode, but the absolute performance may increase depending on the workload that is running.


Allows the user to individually modify any of the low-level settings that are preset and unchangeable in any of the other 4 preset modes.


Enabling Hyper-Threading let operating system addresses two virtual or logical cores for a physical presented core. Workloads can be shared between virtual or logical cores when possible. The main function of hyper-threading is to increase the number of independent instructions in the pipeline for using the processor resources more efficiently.


Legacy: When "Legacy" is selected, the operating system initiates the C-state transitions. For E5/E7 CPUs, ACPI C1/C2/C3 map to Intel C1/C3/C6. For 6500/7500 CPUs, ACPI C1/C3 map to Intel C1/C3 (ACPI C2 is not available). Some OS SW may defeat the ACPI mapping (e.g. intel_idle driver). Autonomous: When "Autonomous" is selected, HALT and C1 request get converted to C6 requests in hardware. Disable: When "Disable" is selected, only C0 and C1 are used by the OS. C1 gets enabled automatically when an OS autohalts.

Flag description origin markings:

[user] Indicates that the flag description came from the user flags file.
[suite] Indicates that the flag description came from the suite-wide flags file.
[benchmark] Indicates that the flag description came from a per-benchmark flags file.

For questions about the meanings of these flags, please contact the tester.
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Copyright 2015-2019 Standard Performance Evaluation Corporation
Tested with SPEC ACCEL v1.2.
Report generated on Wed Aug 7 19:04:33 2019 by SPEC ACCEL flags formatter v1290.