Why is ALFA 0.08 and MIN_DT 20？

[sam6666666]

This is the process I organized. I wonder why ALFA chooses 0.08 and MIN_DT 20？
command: cpulimit -i -l=3
While (1)
{
/ / find the process by pid
Check to see if the cpulimit process is the same. Do not limit yourself

// limit function
Limit_process (pid, limit, include_children);
}

Limit_process (pid, limit, include_children)
{
// all child processes of the pid are added to the hash table with the pid as the key

// read the proc information /proc/stat of the child process pid

/ *

• cputime
• starttime
• /

Update_process_group -> cpu_usage for each polling calculation process
Tmp_process is the currently reread process information

P is the process information for the last process

Double sample = 1.0 * (tmp_process.cputime-p-> cputime)/dt;
Calculate CPU utilization based on two CPU usage times

The first time, p->cpu_usage = sample

After this, p->cpu_usage = (1.0-0.08) * p->cpu_usage + 0.08 * sample;

CPU usage start limit ->

Double pcpu = 1;
// traverses the list of sub-processes and statistics the total CPU utilization of sub-processes (non-statistics less than 0)
Pcpu + = p - > cpu_usage;

If the CPU usage of the sub-process is less than 0 pcpu = -1
For the first time:
Pcap = 0.05
Workingrate = 0.05
Twork. tv_nsec = 100000 * 0.05 * 1000; // CPU usage usage time
After:
Workinfiring = MIN(workinfiring/pcpu * 0.05, 1);
Twork.tv_nsec = 100000 * 1000 * workingrate; // statistics the actual time the process has been running
Tsleep. tv_nsec = 100000 * 1000 - twork.tv_nsec; // the time the process should sleep

// traversal sends SIGCONT signal to the process to make it run

// sleep twork time to keep the process running for so long

The gettimeofday (& the startwork, NULL);

Nanosleep (& twork, NULL);

The gettimeofday (& endwork, NULL);

//nanosleep may wake up in the middle and calculate the actual running time

Workingtime = timediff (& endwork, & the startwork);

// too much sleep is bad
Long delay = workingtime - twork.tv_nsec/1000;

// traversal process sends SIGSTOP signal

// sleep tsleep time, let the process stop running
}

[sam6666666]

Sorry about the typography。