ltp-ddt smp_cpu_affinity

# @name SMP CPU Affinity
# @desc Check that processes assigned to multiple CPUs complete without errors
# @requires smp
# @setup_requires

SMP_S_FUNC_CPUAFFINITY_NO-LB_CORE1
source 'common.sh';  num_cores=`cat /sys/devices/system/cpu/online`;
echo $num_cores | grep -E '[[:digit:]]+\-' > /dev/null &&
multi_run_processes.sh -s "dd if=/dev/urandom of=/dev/null bs=1M
count=10" -l "-n 10 -a 0x1 -d 0"

SMP_S_FUNC_CPUAFFINITY_NO-LB_CORE2
source 'common.sh';  num_cores=`cat /sys/devices/system/cpu/online`;
echo $num_cores | grep -E '[[:digit:]]+\-' > /dev/null &&
multi_run_processes.sh -s "dd if=/dev/urandom of=/dev/null bs=1M
count=10" -l "-n 10 -a 0x2 -d 0"

SMP_S_FUNC_CPUAFFINITY_LB
source 'common.sh';  num_cores=`cat /sys/devices/system/cpu/online`;
echo $num_cores | grep -E '[[:digit:]]+\-' > /dev/null &&
multi_run_processes.sh -s "dd if=/dev/urandom of=/dev/null bs=1M
count=10" -l "-n 20 -a 0xFFFFFFFF -d 0"

 

multi_run_processes.sh -s "dd if=/dev/urandom of=/dev/null bs=1M count=10" -l "-n 10 -a 0x1 -d 0"

 

# usage:
# multi_run_processes.sh <process list> [<process list2> ...] -v
#   where        -v is an optional flag and when present indicates that priority
#                 of two processes has to be verified using time taken
#                 for process execution
#
#                 process_list= -s "#-separated commands" -l "-n <num_instances>
#                        -a <cpu affinity mask> -d <inter-process start delay>
#                        -p <priority> -r <realtime priority>"

 

-s "dd if=/dev/urandom of=/dev/null bs=1M count=10"

-l "-n 10 -a 0x1 -d 0"

 

 

run_processes.sh -c  "dd if=/dev/urandom of=/dev/null bs=1M count=10" -n 10 -a 0x1 -d 0

 

# usage: run_processes.sh -c <"#-separated commands">
#                  [-n <num_of_instances> ]
#                  [-a <cpu_affinity_mask>]
#                  [-d <delay_in_sec> ]
#                  [-p <priority> ]
#                  [-r <realtime priority> ]
#                  [-w] On first failure, wait for all processes
# if cpu affinity is set, then taskset is used to spawn the processes

 

[-a <cpu_affinity_mask>]

在哪个CPU上运行，二进制就在哪一个上赋值为1

那么例如出现pid 8987's current affinity mask: ff   ff是16进制，转换二进制：11111111，意思就是在8个CPU上运行！

比如说16进制的40，那么转换二进制01000000，意思就是在第7块CPU上运作