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/*
* Default load computation module.
*
* This factors in current load, total users, unique users, and how full /tmp
* is. It also penalizes systems with /etc/nologin set. It is suitable for
* balancing a multiuser compute server.
*
* Written by Larry Schwimmer
* Copyright 1998, 2008, 2012
* The Board of Trustees of the Leland Stanford Junior University
*
* See LICENSE for licensing terms.
*/
#include <config.h>
#include <portable/socket.h>
#include <portable/system.h>
#include <server/internal.h>
#include <util/macros.h>
#ifndef MAX
# define MAX(a,b) (((a) > (b)) ? (a) : (b))
#endif
/* Multiplier penalty for nearly full tmp directory. */
static int penalty[] = {
2, 2, 2, 2, /* 90-93% */
4, 4, 4, /* 94-96% */
8, 8, /* 97-98% */
16, /* 99% */
32 /* 100% */
};
/*
* Determine the weight for the node and store it in weight_val. Always use
* an increment of 100.
*
* Since this deals with the raw struct lbcd_reply packet, it must convert
* from network to host order and is thus dependent on the data types in
* protcol.h. A more elegant approach would be desirable; it might not be so
* bad just to call the kernel routines twice.
*/
int
lbcd_load_weight(uint32_t *weight_val, uint32_t *incr_val, int timeout UNUSED,
const char *portarg UNUSED, struct lbcd_reply *lb)
{
int fudge, weight;
int tmp_used;
fudge = (ntohs(lb->tot_users) - ntohs(lb->uniq_users)) * 20;
weight = (ntohs(lb->uniq_users) * 100) + (3 * ntohs(lb->l1)) + fudge;
/* Heavy penalty for a full /tmp partition. */
tmp_used = MAX(lb->tmp_full, lb->tmpdir_full);
if (tmp_used >= 90) {
if (tmp_used > 100)
weight = (uint32_t) -1;
else
weight *= penalty[tmp_used - 90];
}
/* Do not hand out if /etc/nologin exists. */
if (access("/etc/nologin", F_OK) == 0)
weight = (uint32_t) -1;
/* Return weight and increment. */
*weight_val = weight;
*incr_val = 200;
return weight;
}
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