A Performance Monitoring System for Large Computing Clusters
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1 A Performance Monitoring System for Large Computing Clusters Moreno Marzolla Dip. Informatica, Università Ca' Foscari di Venezia and Istituto Nazionale di Fisica Nucleare, Padova, BaBar Collaboration
2 Talk Outline Introduction Case Study: Monitoring the BaBar Computing Farm PerfMC: A prototype of an SNMP- Based monitoring application Conclusions Moreno Marzolla, PDP 2003, Genova, Italy 2
3 Monitoring A monitor is a tool used to observe the activities on a system Collect performance statistics Analyze the data Display the results. Why? Identify frequently used portions of a program; Measure resource utilization to find performance bottlenecks; Characterize the Workload; Find model parameters, validate models, or develop inputs for a model. Moreno Marzolla, PDP 2003, Genova, Italy 3
4 Distributed Systems Monitoring To monitor a distributed system, the monitor needs itself to be (at least partly) distributed. Monitor Observer Observer Observer Observer Host 1 Host 2 Host 3 Host 4 Moreno Marzolla, PDP 2003, Genova, Italy 4
5 BaBar Case Study BaBar is a High Energy Physics experiment, studying matterantimatter asimmetry. Only a small fraction of events has real information ( ) Large amounts of data needed Large computing facilities are required Moreno Marzolla, PDP 2003, Genova, Italy 5
6 BaBar INFN Padova 170 2xPIII 1.26GHz Machines, 1GB Ram, RH Linux Clients 40 Servers Tape Library with a capacity of ~70TB not compressed; Network switches, UPSes, Environmental conditioning systems,... Moreno Marzolla, PDP 2003, Genova, Italy 6
7 Monitoring Requirements Hardware Status Machine Crashes, CPU utilization, Disk I/O, Network I/O... Processes status Environmental conditions Humidity, Temperature, UPS status... Does not need to be a real-time monitor The monitoring system should also be: Reasonably Scalable Efficient (low resources requirement) Flexible and customizable Easy to configure Able to operate in batch mode (as a regular UNIX dæmon, no GUI) Moreno Marzolla, PDP 2003, Genova, Italy 7
8 MRTG Ngop Some existing monitoring tools There are many of them: Netsaint/Nagios Ganglia RemStats Cricket GxSNMP (add your own here) Moreno Marzolla, PDP 2003, Genova, Italy 8
9 So, what's wrong? We examined some publicly available monitoring tools. Unfortunately, many of them were somehow limited: Not scalable Require their own dæmons (observers) running on the monitored hosts Can't install a dæmon on a network switch, or on a tape library Hard to configure In many cases we gave up without being able to try the program. Poorly implemented Heavy use of scripting languages, mixed C/Perl/shell pieces Moreno Marzolla, PDP 2003, Genova, Italy 9
10 The Observer The Observer must be able to collect statistics on any networked equipment We decided to use SNMP (Simple Network Management Protocol) It is implemented by many vendors It is reasonably simple A very good open source implementation is available on Unix/Linux/Win32 platforms Moreno Marzolla, PDP 2003, Genova, Italy 10
11 PerfMC: a Performance Monitor for Clusters Characteristics: Written in C Asynchronous (nonblocking) parallelized SNMP Polling Uses SNMPv2 Bulk Get requests XML-based configuration file The RRDTool package is used to store data and produce graphs Old data have lower resolution than recent ones Round Robin Databases have known, fixed size Graphing capabilities are provided by the library Dynamic generation of HTML pages using XSLT stylesheets PerfMC has an embedded HTTP server Moreno Marzolla, PDP 2003, Genova, Italy 11
12 PerfMC Architecture PerfMC Stylesheets In-core Status XML Configuration File <?xml version="1.0" standalone="no"?> <!DOCTYPE monitor SYSTEM "monitor.dtd"> <monitor>... </monitor> SNMP Poller RRD HTTPD XSLT Engine HTML Pages Graphs Host 1 Host 2 Host n Monitored Hosts Moreno Marzolla, PDP 2003, Genova, Italy 12
13 Example of XML Configuration File <?xml version="1.0" standalone="no"?> <!DOCTYPE monitor SYSTEM "monitor.dtd"> <monitor numconnections="50" pmclogfile="/monitor/pmc.log" httpdlogfile="/dev/null" rrddir="/monitor" htmldir="/monitor/html" pmcverbosity="3" > <host name="localhost" tag= client > <description>this is a sample client machine</description> <miblist> <!-- list of mibs to monitor --> </miblist> <archives> <!-- RRD layout --> </archives> <graphs> <!-- Graph definitions here --> </graphs> </host> </monitor> Moreno Marzolla, PDP 2003, Genova, Italy 13
14 Sample XML configuration file (MIB) <miblist> <mib id='tempmb' name=' '/> <mib id='tempcpu1' name=' '/> <!--.iso.org.dod.internet.private.enterprises.ucdavis.systemstats.sscpurawuser.0 --> <mib id='cpuuser' name=' ' type='counter'/> <!--.iso.org.dod.internet.private.enterprises.ucdavis.systemstats.sscpurawsystem.0 --> <mib id='cpusystem' name=' ' type='counter'/> <!--.iso.org.dod.internet.private.enterprises.ucdavis.systemstats.sscpurawnice.0 --> <mib id='cpunice' name=' ' type='counter'/> <!--.iso.org.dod.internet.mgmt.mib-2.interfaces.iftable.ifentry.ifinoctets.2 --> <mib id='net1in' name=' ' type='counter'/> <!--.iso.org.dod.internet.mgmt.mib-2.interfaces.iftable.ifentry.ifoutoctets.2 --> <mib id='net1out' name=' ' type='counter'/> </miblist> Moreno Marzolla, PDP 2003, Genova, Italy 14
15 Example of XML Status Dump <?xml version="1.0"?> <hosts> <host name="localhost" status="nr"> <mibs> <mib id="availswap" lastupdated=" "> </mib> <mib id="totalswap" lastupdated=" "> </mib> <mib id="totalmem" lastupdated=" "> </mib> <mib id="cachedmem" lastupdated=" "> </mib> <mib id="buffermem" lastupdated=" "> </mib> <mib id="sharedmem" lastupdated=" "> </mib> <mib id="freemem" lastupdated=" "> </mib> <mib id="cpusystem" lastupdated=" "> </mib> <mib id="cpuuser" lastupdated=" "> </mib> <mib id="tempcpu2" lastupdated=" "> </mib> <mib id="tempcpu1" lastupdated=" "> </mib> <mib id="tempmb" lastupdated=" "> </mib> </mibs> <graphs> <graph id="hourly.png" title="hourly data"/> </graphs> </host> </hosts> Moreno Marzolla, PDP 2003, Genova, Italy 15
16 Sample HTML Output Moreno Marzolla, PDP 2003, Genova, Italy 16
17 Another example Moreno Marzolla, PDP 2003, Genova, Italy 17
18 Some Plots Database Server Client Machine Moreno Marzolla, PDP 2003, Genova, Italy 18
19 PerfMC Performances Reasonably low CPU Utilization ( << 5%) Reasonably low Network Utilization (11 KB/s) Not-so low Disk Utilization (1.2 MB/s) Moreno Marzolla, PDP 2003, Genova, Italy 19
20 Conclusions Monitoring a large computing cluster is a highly nontrivial task. Many available monitoring tools exist, but many of them are not adequate for large distributed systems. We are trying to build a general-purpose SNMP and XML-based monitoring tool. A prototype exists and is working well Moreno Marzolla, PDP 2003, Genova, Italy 20
21 Future work Alarms are not currently implemented, but are at the top position of the to-do list At the moment there are no serious problems. PerfMC is running on the production cluster ( 170 machines) Clearly cannot scale forever No attention has been put on security Could easily be extended for SNMPv3 Not a priority. Our cluster is on a private network Moreno Marzolla, PDP 2003, Genova, Italy 21
22 Bibliography W. Stallings, SNMP, SNMPv2, SNMPv3 and RMON 1 and 2, third edition, Addison-Wesley, 1999 R. Jain, The art of computer systems performance analysis: Techniques for Experimental Design, Measurement, Simulation, and Modeling, John Wiley and Sons, 1991 Grid Performance Working Group RRD Tools Home Page BaBar Farm home page (will contain PerfMC) BaBar Farm Monitoring Page Moreno Marzolla, PDP 2003, Genova, Italy 22
23 More on SNMP GetRequest Management Application GetNextRequest SetRequest SNMP UDP IP GetResponse Trap Network Protocol SNMP Messages LAN/WAN Managed Resources SNMP Managed Objects GetRequest GetNextRequest SetRequest GetResponse Trap SNMP UDP IP Network Protocol W. Stallings, SNMP, SNMPv2, SNMPv3 and RMON 1 and 2, 3rd edition, p. 81 Moreno Marzolla, PDP 2003, Genova, Italy 23
24 Round Robin Databases Value Drop Old data Recent data Time Moreno Marzolla, PDP 2003, Genova, Italy 24
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