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run backup uploader with a nice of 15

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the gzip takes a lot of cpu processing and hogs the CPU. With a nice
level, we give other things higher priority.

An alternate idea that was explored was to use cpulimit. This is to
send SIGSTOP and SIGCONT periodically but this will not make use of the
CPU if it's idle (unlike nice).

Another idea is to use cgroups, but it's not clear how to use it with
the dynamic setup we have.

part of #691
This commit is contained in:
Girish Ramakrishnan
2020-07-31 16:35:06 -07:00
parent a94b175805
commit d2882433a5
2 changed files with 11 additions and 5 deletions
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14
src/shell.js
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@@ -13,7 +13,8 @@ var assert = require('assert'),
once = require('once'),
util = require('util');
var SUDO = '/usr/bin/sudo';
const SUDO = '/usr/bin/sudo';
const NICE = '/usr/bin/nice';
function exec(tag, cmd, callback) {
assert.strictEqual(typeof tag, 'string');
@@ -39,11 +40,16 @@ function spawn(tag, file, args, options, callback) {
callback = once(callback); // exit may or may not be called after an 'error'
debug(tag + ' spawn: %s %s', file, args.join(' '));
if (options.ipc) options.stdio = ['pipe', 'pipe', 'pipe', 'ipc'];
var cp = child_process.spawn(file, args, options);
if (options.nice) {
args = ['-n', options.nice, file].concat(args);
file = NICE;
}
debug(tag + ' spawn: %s %s', file, args.join(' '));
const cp = child_process.spawn(file, args, options);
if (options.logStream) {
cp.stdout.pipe(options.logStream);
cp.stderr.pipe(options.logStream);