我正在尝试让guitarix和jack在带有raspbian的Raspberry Pi 2（+ Cirrus声卡）上运行。通过 qjackctl 启动千斤顶时，出现错误
Cannot lock down 82278944 byte memory area (Cannot allocate memory)
Cannot use real-time scheduling (RR/10)(1: Operation not permitted)
似乎对/etc/security/limits.conf的更改不适用，但对/etc/security/limits.d/audio.conf有效。
我尝试为用户和组设置内存锁定大小：
@audio - rtprio 90 # maximum realtime priority
@audio - memlock unlimited # maximum locked-in-memory address space (KB)
@audio - nice -10
pi - rtprio 90
pi - memlock unlimited
pi - nice -10
从 ssh 我得到了满意的结果：
pi@raspberrypi ~ $ ulimit -a
core file size (blocks, -c) 0
data seg size (kbytes, -d) unlimited
scheduling priority (-e) 30
file size (blocks, -f) unlimited
pending signals (-i) 7349
max locked memory (kbytes, -l) unlimited
max memory size (kbytes, -m) unlimited
open files (-n) 1024
pipe size (512 bytes, -p) 8
POSIX message queues (bytes, -q) 819200
real-time priority (-r) 90
stack size (kbytes, -s) 8192
cpu time (seconds, -t) unlimited
max user processes (-u) 7349
virtual memory (kbytes, -v) unlimited
file locks (-x) unlimited
但是从我通过 vnc 访问的桌面终端我得到
pi@raspberrypi ~ $ ulimit -a
core file size (blocks, -c) 0
data seg size (kbytes, -d) unlimited
scheduling priority (-e) 0
file size (blocks, -f) unlimited
pending signals (-i) 7349
max locked memory (kbytes, -l) 64
max memory size (kbytes, -m) unlimited
open files (-n) 1024
pipe size (512 bytes, -p) 8
POSIX message queues (bytes, -q) 819200
real-time priority (-r) 0
stack size (kbytes, -s) 8192
cpu time (seconds, -t) unlimited
max user processes (-u) 7349
virtual memory (kbytes, -v) unlimited
file locks (-x) unlimited
同一个用户如何有不同的设置，我如何在桌面上运行 rt 和内存分配？