Updated for systemd user units, fleshed out INSTALL.md

.gitignore

@@ -1,9 +1,12 @@
 *
-!psi-alerts.sh
-!psi-alerts@.service
-!psi-monitor.service
-!psi-by-example
 !.gitignore
 !CONFIGURE.md
 !INSTALL.md
 !README.md
+!psi-alerts-user.service
+!psi-alerts.sh
+!psi-alerts@.service
+!psi-by-example
+!psi-monitor-user.service
+!psi-monitor.service
+!psi-monitor.sh

CONFIGURE.md

@@ -1,19 +1,26 @@
-# CONFIGURE
-Included in this project are a number of systemd units:
+# CONFIGURE Included in this project are a number of systemd units:
     * psi-monitor.service
         * uses psi-monitor executable (in /usr/bin/)
-    * psi-alerts@.service (system template service)
-        * uses psi-alerts.sh script
+    * psi-alerts@.service (systemd template service)
+        * uses psi-alerts.sh script in */usr/local/bin/*
+    * psi-alerts-user.service (systemd user service)
+        * also uses psi-alerts.sh script in *~/bin/* (or wherever you want to
+          put it)
 
 The `psi-alerts.sh` is essentially a daemon (a systemd simple service), and for
 now the systemd template needs to be instantiated with the username that will
-execute `psi-alerts.sh`.  Also, a systemd unit override should be created, like
-so:  
+execute `psi-alerts.sh` (if using the systemd template).  Also, a systemd unit
+override should be created, like so:  
 
 ```
+sudo cp psi-alerts@.service /etc/systemd/system/
 sudo systemctl edit psi-alerts@<user>.service
 ```
-
+--OR--
+```
+cp psi-alerts-user.service ~/.config/systemd/user/psi-alerts.service
+systemctl --user edit psi-alerts.service
+```
 This will open an editor, and in later versions of systemd the comment code will be included, clearly showing where the override should be entered:
 
 ```
@@ -32,17 +39,21 @@ Environment=SSH_HOST="localhost"
 Environment=SSH_PORT=5999
 Environment=SSH_ID_PATH="~user/.ssh/psi-alerts"
 Environment=CLEAR_THRESHOLD="5.0"
+ExecStart=  # Clear ExecStart for user unit
+ExecStart=/path/to/psi-alerts.sh --user # User unit
 
 ### Edits below this comment will be discarded
 
 ### /etc/systemd/system/psi-alerts@.service
 # [Unit]
 # Description=Pressure Stall Information (PSI) alerts
-# PartOf=multi-user.target
+# PartOf=multi-user.target  # system template
+# PartOf=default.target     # user service
 # After=psi-monitor.service
 #
 # [Service]
-# User=%i
+# 
+# User=%i # User unit will not have User=%i
 # Type=simple
 # ExecStart=psi-alerts.sh
 #
@@ -85,5 +96,5 @@ All of these are required except where noted, there are no default options
   (SMS and email will still work, as they don't use SSH)
 * **CLEAR_THRESHOLD**:  The percentage threshold the some avg300 threshold
   should be below before considering the alert cleared.  This will depend
-  highly on the workload running on 
+  highly on the workload running on the system.
 

INSTALL.md

@@ -4,4 +4,60 @@ First, clone this repository with the `--recurse-submodules` flag:
 $ git clone --recurse-submodules https://git.eldon.me/trey/psi-alerts.git
 ```
 
+`--recurse-submodules` is only necessary if you wish to use the modified
+psi-by-example program for `psi-monitor`.  I found this too noisy to be of use,
+it alerts too quickly so I wrote my own with relaxed timing.
+
+If you want to use the psi-by-example/psi-monitor code, you'll need to compile
+it: 
+
+```
+gcc -o psi-monitor psi-monitor.c
+``` 
+
+## Using the systemd template unit
+1.  Copy the `psi-alerts.sh` and `psi-monitor.sh` scripts to */usr/local/bin*:
+
+    ```
+    sudo cp psi-alerts.sh /usr/local/bin
+    sudo cp psi-monitor.sh /usr/local/bin/psi-monitor 
+    ### OR ###
+    sudo cp psi-by-example/psi-monitor /usr/local/bin
+    ```
+
+2.  Copy the systemd units to */etc/systemd/system*:
+
+    ```
+    sudo cp psi-alerts@.service psi-monitor.service /etc/systemd/system/
+    ```
+
+
+## Using the systemd user units
+1.  Copy the `psi-alerts.sh` and `psi-monitor.sh` scripts to *~/bin* (or
+    wherever you want them):
+    
+    ```
+    cp -a psi-alerts.sh psi-monitor.sh ~/bin/
+    ```
+
+2.  Copy the systemd user units to *~/.config/systemd/user/*
+
+    ```
+    cp psi-alerts-user.service ~/.config/systemd/user/psi-alerts.service
+    cp psi-monitor-user.service ~/.config/systemd/user/psi-monitor.service
+    ```
+
+# CONFIGURE
+See *CONFIGURE.md* in this repository
+
+# ENABLE and START
+## system template instance:
+```
+sudo systemctl enable --now psi-monitor.service psi-alerts@<user>.service
+```
+
+## User instance
+```
+systemctl --user enable --now psi-monitor.service psi-alerts.service
+```
 

psi-alerts-user.service

@@ -0,0 +1,12 @@
+[Unit]
+Description=Pressure Stall Information (PSI) alerts
+PartOf=default.target
+After=psi-monitor.service
+
+[Service]
+Type=simple
+ExecStart=psi-alerts.sh
+
+[Install]
+WantedBy=default.target
+

psi-alerts.sh

@@ -42,6 +42,7 @@ svc="psi-monitor.service"
 cpu="/proc/pressure/cpu"
 mem="/proc/pressure/memory"
 io="/proc/pressure/io"
+user="$(whoami)"
 host="$(hostname)"
 email_to="${EMAIL_TO}"
 sms_dst="${SMS_DST}"
@@ -55,11 +56,21 @@ notification_cmd="${NOTIFICATION_CMD}"
 notification_hist_cmd="${NOTIFICATION_HIST_CMD}"
 notification_opts="${NOTIFICATION_OPTS}"
 id_idx="${NOTIFICATION_IDX}"
+user=false
+
+if [[ -n "${1}" ]]; then
+    if  [[ "${1}" == "-u" ]] || \
+        [[ "${1}" == "--user" ]]; then
+        user=true
+    fi 
+fi
        
 get_ssh_agent () {
     for dir in /tmp/ssh-*; do
         if [[ -O ${dir} ]]; then
             # only choose the last agent
+            export SSH_AGENT_PID=$(ps -eaf | grep '[s]sh-agent' | \
+                                   grep ${user} | awk '{print $2}')
             export SSH_AUTH_SOCK=$(ls ${dir}/agent.* | tail -1)
         fi
     done
@@ -76,17 +87,23 @@ print_psi () {
     cat "${(P)$(tr '[[:upper:]]' '[[:lower:]]' <<< "${psi_file}")}"
 }
 
-print_pidstat () {
+print_stats () {
     local psi_type="${1}"
 
     case "${psi_type}" in
         CPU)
+            top -bcn1 -o %CPU -w 512 | head -n 30
+            printf "\n\n"
             pidstat -ul --human
             ;;
         IO)
+            sudo iotop --batch --only --iter=10
+            printf "\n\n"
             pidstat -dl --human
             ;;
         MEM)
+            top -bcn1 -o %MEM -w 512 | head -n 30
+            printf "\n\n"
             pidstat -rl --human
             ;;
         *)
@@ -123,7 +140,7 @@ send_notice () {
                 print "Connection to notification daemon failed!" >&2
                 false
         else
-            echo ${notification_id}
+            print ${notification_id}
             true
         fi
     elif [[ -n "${ssh_id_path}" ]]; then
@@ -132,11 +149,11 @@ send_notice () {
                 print "Connection to notification daemon failed!" >&2
                 false
         else
-            echo ${notification_id}
+            print ${notification_id}
             true
         fi
     else
-        echo "No SSH notifications configured.  Returning." >&2
+        print "No SSH notifications configured.  Returning." >&2
         false
     fi
     #set +x
@@ -145,7 +162,7 @@ send_notice () {
 send () {
     #set -x
     if [[ "${#@}" -lt 2 ]] && [[ "${#@}" -gt 3 ]]; then
-        echo "Wrong number of arguments to send()!" >&2
+        print "Wrong number of arguments to send()!" >&2
         return false
     fi
 
@@ -177,12 +194,13 @@ send () {
         subj="PSI on ${host} ${psi_type} triggered!"
         current_alarms="${psi_type}"
     fi
-
+    print_psi "${psi_type}" >> ${email}
+    printf "\n\n" >> ${email}
     # is this an email or SMS?
     if [[ ! "${dst}" =~ "@${sms_domain}" ]]; then
         for p in $(tr '|' ' ' <<< "${current_alarms}"); do
-            printf "\npidstat info for ${p}\n\n" >> ${email}
-            print_pidstat "${p}" >> ${email}
+            printf "\n\nStatistics info for ${p}\n\n" >> ${email}
+            print_stats "${p}" >> ${email}
             printf "\n\n" >> ${email}
         done
     fi
@@ -226,7 +244,7 @@ exec_notices () {
                 send "${psi_type}" "${current_alarms}" "${email_to}"
                 ;;
             *)
-                echo "Something went wrong!" >&2
+                print "Something went wrong!" >&2
                 false
                 ;;
         esac
@@ -247,7 +265,7 @@ check_dunst_id_is_visible () {
         "${notification_hist_cmd} | jq '.data[0][].id.data'"); then
         if ! ids=$(ssh -qi "${ssh_id_path}" -p ${ssh_port} -l "${ssh_user}" \
             "${ssh_host}" "${notification_hist_cmd} | jq '.data[0][].id.data'"); then
-                echo "Connection to dunst failed!" >&2
+                print "Connection to dunst failed!" >&2
                 return 2
         fi
     fi
@@ -261,64 +279,65 @@ check_dunst_id_is_visible () {
 }
 
 local current_alarm=""
-local last_alarm=""
 typeset -A notice_sent
 typeset -A secs
 integer last_dunst_id=-1
 local last_line=""
 
-set -x
+#set -x
 while true; do
-    local line=$(journalctl -u ${svc} -n1)
+    if ${user}; then
+        line=$(journalctl --user -u ${svc} -n1)
+    else
+        line=$(journalctl -u ${svc} -n1)
+    fi
+    now=$(date +%s)
+    last_timestamp=$(date -d "$(awk '{print $1" "$2" "$3}' <<< "${line}")" +%s)
+    time_diff=$(( now - last_timestamp ))
     if [[ "${last_line}" == "${line}" ]]; then
-        # line hasn't changed since last run, do nothing
+        # last line hasn't changed, check to see if we can clear alarms
+        if (( time_diff >= 3 )); then
+            # haven't seen a monitor alert for 3 seconds, see if we can clear them
+            if [[ -n "${current_alarms}" ]]; then
+                typeset -a alarms=( $(tr '|' ' ' <<< "$current_alarms") )
+                for alarm in ${alarms}; do
+                    integer elapsed=$(( now - ${secs[${alarm}]} ))
+                    if is_clear "${alarm}" && (( elapsed >= 300 )); then
+                        current_alarms=$(sed -E "s/${alarm}\|?//; s/|$//" <<< "${current_alarms}")
+                        unset "notice_sent[${alarm}]"
+                        unset "secs[${alarm}]"
+                    fi
+                done
+            fi
+            sleep 1
+            continue
+        fi
+    
         sleep 1
         continue
     fi
     last_line="${line}"
-    local now=$(date +%s)
-    local last_timestamp=$(date -d $(awk '{print $1" "$2" "$3}' <<< "${line}") +%s)
-    local time_diff=$(( now - last_timestamp ))
-    if (( time_diff >= 3 )); then
-        # haven't seen a monitor alert for 3 seconds, see if we can clear them
-        if [[ -n "${current_alarms}" ]]; then
-            typeset -a alarms=( $(tr '|' ' ' <<< "$current_alarms") )
-            for alarm in ${alarms}; do
-                integer elapsed=$(( now - ${secs[${alarm}]} ))
-                if is_clear "${alarm}" && (( elapsed >= 300 )); then
-                    current_alarms=$(sed -E "s/${alarm}\|?//" <<< "${current_alarms}")
-                    last_alarm=$(awk -F'|' '{print $NF}' <<< "${current_alarms}")
-                    unset "notice_sent[${alarm}]"
-                    unset "secs[${alarm}]"
-                fi
-            done
-        fi
-        sleep 1
-        continue
-    fi
-    local psi_type="$(grep -Eo "(CPU|MEM|IO) PSI event" <<< "${line}" | grep -Eo "CPU|MEM|IO")"
-    if [[ -n "${psi_type}" ]]; then
-        secs+=(${psi_type} ${now})
-        if [[ "${psi_type}" != "${last_alarm}" ]]; then
+    if (( time_diff < 3 )); then
+        local psi_type="$(grep -Eo "(CPU|MEM|IO) PSI event" <<< "${line}" | grep -Eo "CPU|MEM|IO")"
+        if [[ -n "${psi_type}" ]]; then
+            secs+=(${psi_type} ${now})
             if [[ ! ${notice_sent[${psi_type}]} ]]; then
                 last_dunst_id=$(exec_notices "${psi_type}" "${current_alarms}")
                 notice_sent+=(${psi_type} true)
             elif (( last_dunst_id >= 0 )) && check_dunst_id_is_visible "${last_dunst_id}"; then
-                last_alarm="${psi_type}"
                 sleep 1
                 continue
             fi
-        fi
-        last_alarm="${psi_type}"
-        if [[ -z "${current_alarms}" ]]; then
-            current_alarms="${psi_type}"
-        else
-            if ! grep -q "${psi_type}" <<< "${current_alarms}"; then
-                current_alarms="${current_alarms}|${psi_type}"
+            if [[ -z "${current_alarms}" ]]; then
+                current_alarms="${psi_type}"
+            else
+                if ! grep -q "${psi_type}" <<< "${current_alarms}"; then
+                    current_alarms="${current_alarms}|${psi_type}"
+                fi
             fi
         fi
     fi
     sleep 1
 done
-set +x
+#set +x
 

psi-monitor-user.service

@@ -0,0 +1,10 @@
+[Unit]
+Description=Pressure Stall Information (PSI) Monitor
+PartOf=default.target
+
+[Service]
+Type=simple
+ExecStart=/home/trey/bin/psi-monitor.sh 80
+
+[Install]
+WantedBy=default.target

psi-monitor.sh

@@ -0,0 +1,62 @@
+#!/usr/bin/env zsh
+#
+# Pressure Stall Information monitor
+#
+#    Copyright © 2023 Trey Blancher $(base64 -d <<< dHJleUBibGFuY2hlci5uZXQK)
+#
+#    This program is free software: you can redistribute it and/or modify it
+#    under the terms of the GNU General Public License as published by the Free
+#    Software Foundation, either version 3 of the License, or (at your option)
+#    any later version.
+#
+#    This program is distributed in the hope that it will be useful, but
+#    WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+#    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+#    for more details.
+#
+#    You should have received a copy of the GNU General Public License along
+#    with this program.  If not, see <https://www.gnu.org/licenses/>.
+#
+#    Submodules may be distributed under a separate software license;  see the
+#    LICENSE file within each submodule.
+# 
+# This script monitors the three pressure stall information files
+# /proc/pressure{cpu,io,memory} and reports if any resource is above threshold
+# for the "some" values.  It takes an optional single argument, the threshold at
+# which to alert.  If this is not supplied, it defaults to a threshold of 30.0 
+# percent.
+#
+
+local cpu="/proc/pressure/cpu"
+local cpu_ctr=0
+local io="/proc/pressure/io"
+local io_ctr=0
+local mem="/proc/pressure/memory"
+local mem_ctr=0
+local threshold=30.0
+
+if [[ -n "${1}" ]]; then
+    threshold=${1}
+fi
+
+# main loop
+while true; do
+    local cpu_pct=$(grep 'some' ${cpu} | awk '{print $2}' | awk -F'=' '{print $2}')    
+    local io_pct=$(grep 'some' ${io} | awk '{print $2}' | awk -F'=' '{print $2}')    
+    local mem_pct=$(grep 'some' ${mem} | awk '{print $2}' | awk -F'=' '{print $2}')    
+    
+    if (( cpu_pct > threshold )); then
+        cpu_ctr=$(( ${cpu_ctr} + 1 ))
+        printf "CPU PSI event %d triggered.\n" ${cpu_ctr}
+    fi
+    if (( io_pct > threshold )); then
+        io_ctr=$(( ${io_ctr} + 1 ))
+        printf "IO PSI event %d triggered.\n" ${io_ctr}
+    fi
+    if (( mem_pct > threshold )); then
+        mem_ctr=$(( ${mem_ctr} + 1 ))
+        printf "MEM PSI event %d triggered.\n" ${mem_ctr}
+    fi
+
+    sleep 10
+done