2015-07-11
Additional charts
Host zm08.stanford.edu: Total CPU
avg(user) = 3.76 avg(sys) = 0.45 avg(idle) = 93.85 avg(iowait) = 1.90 avg(nice) = 0.00 avg(irq) = 0.00 avg(softirq) = 0.02
Host zm08.stanford.edu: Individual CPU user time
avg(cpu0) = 11.84 avg(cpu1) = 15.20 avg(cpu2) = 3.57 avg(cpu3) = 9.62 avg(cpu4) = 3.35 avg(cpu5) = 3.68 avg(cpu6) = 1.28 avg(cpu7) = 4.66 avg(cpu8) = 1.00 avg(cpu9) = 1.79 avg(cpu10) = 0.90 avg(cpu11) = 1.56 avg(cpu12) = 4.11 avg(cpu13) = 6.19 avg(cpu14) = 2.97 avg(cpu15) = 3.76 avg(cpu16) = 2.65 avg(cpu17) = 3.35 avg(cpu18) = 1.25 avg(cpu19) = 1.62 avg(cpu20) = 0.83 avg(cpu21) = 2.20 avg(cpu22) = 0.69 avg(cpu23) = 2.18
Host zm08.stanford.edu: Individual CPU nice time
avg(cpu0) = 0.00 avg(cpu1) = 0.00 avg(cpu2) = 0.00 avg(cpu3) = 0.00 avg(cpu4) = 0.00 avg(cpu5) = 0.00 avg(cpu6) = 0.00 avg(cpu7) = 0.00 avg(cpu8) = 0.00 avg(cpu9) = 0.00 avg(cpu10) = 0.00 avg(cpu11) = 0.00 avg(cpu12) = 0.00 avg(cpu13) = 0.00 avg(cpu14) = 0.00 avg(cpu15) = 0.00 avg(cpu16) = 0.00 avg(cpu17) = 0.00 avg(cpu18) = 0.00 avg(cpu19) = 0.00 avg(cpu20) = 0.00 avg(cpu21) = 0.00 avg(cpu22) = 0.00 avg(cpu23) = 0.00
Host zm08.stanford.edu: Individual CPU sys time
avg(cpu0) = 0.93 avg(cpu1) = 1.07 avg(cpu2) = 0.42 avg(cpu3) = 0.96 avg(cpu4) = 0.46 avg(cpu5) = 0.46 avg(cpu6) = 0.22 avg(cpu7) = 0.50 avg(cpu8) = 0.20 avg(cpu9) = 0.25 avg(cpu10) = 0.16 avg(cpu11) = 0.20 avg(cpu12) = 0.53 avg(cpu13) = 0.59 avg(cpu14) = 0.78 avg(cpu15) = 0.66 avg(cpu16) = 0.50 avg(cpu17) = 0.49 avg(cpu18) = 0.25 avg(cpu19) = 0.25 avg(cpu20) = 0.20 avg(cpu21) = 0.31 avg(cpu22) = 0.15 avg(cpu23) = 0.29
Host zm08.stanford.edu: Individual CPU idle time
avg(cpu0) = 71.19 avg(cpu1) = 66.59 avg(cpu2) = 95.19 avg(cpu3) = 88.42 avg(cpu4) = 95.67 avg(cpu5) = 95.35 avg(cpu6) = 98.34 avg(cpu7) = 94.53 avg(cpu8) = 98.71 avg(cpu9) = 97.85 avg(cpu10) = 98.88 avg(cpu11) = 98.16 avg(cpu12) = 91.38 avg(cpu13) = 88.86 avg(cpu14) = 96.02 avg(cpu15) = 95.32 avg(cpu16) = 96.69 avg(cpu17) = 95.88 avg(cpu18) = 98.41 avg(cpu19) = 98.02 avg(cpu20) = 98.91 avg(cpu21) = 97.35 avg(cpu22) = 99.11 avg(cpu23) = 97.38
Host zm08.stanford.edu: Individual CPU iowait time
avg(cpu0) = 15.90 avg(cpu1) = 16.92 avg(cpu2) = 0.79 avg(cpu3) = 0.86 avg(cpu4) = 0.46 avg(cpu5) = 0.48 avg(cpu6) = 0.14 avg(cpu7) = 0.24 avg(cpu8) = 0.09 avg(cpu9) = 0.08 avg(cpu10) = 0.04 avg(cpu11) = 0.06 avg(cpu12) = 3.94 avg(cpu13) = 4.32 avg(cpu14) = 0.22 avg(cpu15) = 0.24 avg(cpu16) = 0.15 avg(cpu17) = 0.23 avg(cpu18) = 0.09 avg(cpu19) = 0.10 avg(cpu20) = 0.05 avg(cpu21) = 0.10 avg(cpu22) = 0.03 avg(cpu23) = 0.10
Host zm08.stanford.edu: Individual CPU irq time
avg(cpu0) = 0.00 avg(cpu1) = 0.00 avg(cpu2) = 0.00 avg(cpu3) = 0.00 avg(cpu4) = 0.00 avg(cpu5) = 0.00 avg(cpu6) = 0.00 avg(cpu7) = 0.00 avg(cpu8) = 0.00 avg(cpu9) = 0.00 avg(cpu10) = 0.00 avg(cpu11) = 0.00 avg(cpu12) = 0.00 avg(cpu13) = 0.00 avg(cpu14) = 0.00 avg(cpu15) = 0.00 avg(cpu16) = 0.00 avg(cpu17) = 0.00 avg(cpu18) = 0.00 avg(cpu19) = 0.00 avg(cpu20) = 0.00 avg(cpu21) = 0.00 avg(cpu22) = 0.00 avg(cpu23) = 0.00
Host zm08.stanford.edu: Individual CPU softirq time
avg(cpu0) = 0.12 avg(cpu1) = 0.21 avg(cpu2) = 0.02 avg(cpu3) = 0.13 avg(cpu4) = 0.05 avg(cpu5) = 0.03 avg(cpu6) = 0.01 avg(cpu7) = 0.06 avg(cpu8) = 0.00 avg(cpu9) = 0.01 avg(cpu10) = 0.00 avg(cpu11) = 0.01 avg(cpu12) = 0.03 avg(cpu13) = 0.03 avg(cpu14) = 0.00 avg(cpu15) = 0.01 avg(cpu16) = 0.00 avg(cpu17) = 0.03 avg(cpu18) = 0.00 avg(cpu19) = 0.00 avg(cpu20) = 0.00 avg(cpu21) = 0.02 avg(cpu22) = 0.00 avg(cpu23) = 0.03
Host zm08.stanford.edu: Process CPU
avg(mailbox) = 2.50 avg(mysql) = 0.76 avg(stats) = 0.00
Host zm08.stanford.edu: Process Total Memory
avg(mailbox) = 21247.23 avg(mysql) = 18179.60 avg(stats) = 0.00
Host zm08.stanford.edu: Process Resident Memory
avg(mailbox) = 8885.82 avg(mysql) = 17898.73 avg(stats) = 0.00
Host zm08.stanford.edu: Virtual Memory
avg(swapped) = 21.93 avg(free) = 1402.72 avg(active) = 40187.46 avg(inactive) = 20404.46 avg(page cache) = 27585.22
Host zm08.stanford.edu: Context Switches
avg(context switches) = 5156.53
Host zm08.stanford.edu: Run/Blocked Process Queue Size, Load Average
avg(processes waiting for run time) = 1.43 avg(processes waiting for io time) = 0.68 avg(load average (1 min)) = 1.81
Host zm08.stanford.edu: Disk Utilization (Top 10 avg)
avg(sdf) = 11.88 avg(sdk) = 11.88 avg(dm-0) = 19.97 avg(sdg) = 8.19 avg(sdl) = 8.19 avg(sdh) = 8.87 avg(dm-4) = 12.07 avg(dm-3) = 10.33 avg(sdm) = 8.87 avg(sdu) = 4.90
Host zm08.stanford.edu: Disk Throughput: /dev/sde
avg(sde read) = 0.19 avg(sde write) = 0.00
Host zm08.stanford.edu: Disk Throughput: /dev/sdf
avg(sdf read) = 447.01 avg(sdf write) = 520.39
Host zm08.stanford.edu: Disk Throughput: /dev/sda
avg(sda read) = 0.19 avg(sda write) = 0.00
Host zm08.stanford.edu: Disk Throughput: /dev/sdk
avg(sdk read) = 446.82 avg(sdk write) = 520.24
Host zm08.stanford.edu: Disk Throughput: /dev/sdt
avg(sdt read) = 0.19 avg(sdt write) = 0.00
Host zm08.stanford.edu: Disk Throughput: /dev/sdq
avg(sdq read) = 0.19 avg(sdq write) = 0.00
Host zm08.stanford.edu: Disk Throughput: /dev/sdj
avg(sdj read) = 0.40 avg(sdj write) = 59.46
Host zm08.stanford.edu: Disk Throughput: /dev/dm-0
avg(dm-0 read) = 893.44 avg(dm-0 write) = 1040.62
Host zm08.stanford.edu: Disk Throughput: /dev/sdg
avg(sdg read) = 501.26 avg(sdg write) = 157.60
Host zm08.stanford.edu: Disk Throughput: /dev/dm-1
avg(dm-1 read) = 701.17 avg(dm-1 write) = 786.06
Host zm08.stanford.edu: Disk Throughput: /dev/dm-2
avg(dm-2 read) = 0.40 avg(dm-2 write) = 118.31
Host zm08.stanford.edu: Disk Throughput: /dev/sdl
avg(sdl read) = 501.97 avg(sdl write) = 157.29
Host zm08.stanford.edu: Disk Throughput: /dev/sdc
avg(sdc read) = 0.19 avg(sdc write) = 0.00
Host zm08.stanford.edu: Disk Throughput: /dev/sdr
avg(sdr read) = 0.19 avg(sdr write) = 0.00
Host zm08.stanford.edu: Disk Throughput: /dev/sds
avg(sds read) = 0.19 avg(sds write) = 0.00
Host zm08.stanford.edu: Disk Throughput: /dev/sdi
avg(sdi read) = 350.81 avg(sdi write) = 392.02
Host zm08.stanford.edu: Disk Throughput: /dev/sdh
avg(sdh read) = 920.35 avg(sdh write) = 0.23
Host zm08.stanford.edu: Disk Throughput: /dev/dm-4
avg(dm-4 read) = 1840.65 avg(dm-4 write) = 0.49
Host zm08.stanford.edu: Disk Throughput: /dev/sdb
avg(sdb read) = 0.19 avg(sdb write) = 0.00
Host zm08.stanford.edu: Disk Throughput: /dev/dm-3
avg(dm-3 read) = 1002.83 avg(dm-3 write) = 314.89
Host zm08.stanford.edu: Disk Throughput: /dev/sdm
avg(sdm read) = 920.68 avg(sdm write) = 0.25
Host zm08.stanford.edu: Disk Throughput: /dev/sdp
avg(sdp read) = 0.19 avg(sdp write) = 0.00
Host zm08.stanford.edu: Disk Throughput: /dev/sdn
avg(sdn read) = 350.75 avg(sdn write) = 394.03
Host zm08.stanford.edu: Disk Throughput: /dev/sdu
avg(sdu read) = 23.22 avg(sdu write) = 37.11
Host zm08.stanford.edu: Disk Throughput: /dev/sdd
avg(sdd read) = 0.19 avg(sdd write) = 0.00
Host zm08.stanford.edu: Disk Throughput: /dev/sdo
avg(sdo read) = 0.40 avg(sdo write) = 58.85
Host zm08.stanford.edu: Disk IOPs: /dev/sde
avg(sde read) = 0.05 avg(sde write) = 0.00
Host zm08.stanford.edu: Disk IOPs: /dev/sdf
avg(sdf read) = 28.36 avg(sdf write) = 21.44
Host zm08.stanford.edu: Disk IOPs: /dev/sda
avg(sda read) = 0.05 avg(sda write) = 0.00
Host zm08.stanford.edu: Disk IOPs: /dev/sdk
avg(sdk read) = 28.36 avg(sdk write) = 21.44
Host zm08.stanford.edu: Disk IOPs: /dev/sdt
avg(sdt read) = 0.05 avg(sdt write) = 0.00
Host zm08.stanford.edu: Disk IOPs: /dev/sdq
avg(sdq read) = 0.05 avg(sdq write) = 0.00
Host zm08.stanford.edu: Disk IOPs: /dev/sdj
avg(sdj read) = 0.10 avg(sdj write) = 0.45
Host zm08.stanford.edu: Disk IOPs: /dev/dm-0
avg(dm-0 read) = 56.62 avg(dm-0 write) = 42.87
Host zm08.stanford.edu: Disk IOPs: /dev/sdg
avg(sdg read) = 29.06 avg(sdg write) = 17.29
Host zm08.stanford.edu: Disk IOPs: /dev/dm-1
avg(dm-1 read) = 12.42 avg(dm-1 write) = 26.73
Host zm08.stanford.edu: Disk IOPs: /dev/dm-2
avg(dm-2 read) = 0.10 avg(dm-2 write) = 0.89
Host zm08.stanford.edu: Disk IOPs: /dev/sdl
avg(sdl read) = 29.06 avg(sdl write) = 17.28
Host zm08.stanford.edu: Disk IOPs: /dev/sdc
avg(sdc read) = 0.05 avg(sdc write) = 0.00
Host zm08.stanford.edu: Disk IOPs: /dev/sdr
avg(sdr read) = 0.05 avg(sdr write) = 0.00
Host zm08.stanford.edu: Disk IOPs: /dev/sds
avg(sds read) = 0.05 avg(sds write) = 0.00
Host zm08.stanford.edu: Disk IOPs: /dev/sdi
avg(sdi read) = 6.26 avg(sdi write) = 13.36
Host zm08.stanford.edu: Disk IOPs: /dev/sdh
avg(sdh read) = 18.96 avg(sdh write) = 0.02
Host zm08.stanford.edu: Disk IOPs: /dev/dm-4
avg(dm-4 read) = 37.82 avg(dm-4 write) = 0.04
Host zm08.stanford.edu: Disk IOPs: /dev/sdb
avg(sdb read) = 0.05 avg(sdb write) = 0.00
Host zm08.stanford.edu: Disk IOPs: /dev/dm-3
avg(dm-3 read) = 58.02 avg(dm-3 write) = 34.57
Host zm08.stanford.edu: Disk IOPs: /dev/sdm
avg(sdm read) = 18.96 avg(sdm write) = 0.02
Host zm08.stanford.edu: Disk IOPs: /dev/sdp
avg(sdp read) = 0.05 avg(sdp write) = 0.00
Host zm08.stanford.edu: Disk IOPs: /dev/sdn
avg(sdn read) = 6.26 avg(sdn write) = 13.37
Host zm08.stanford.edu: Disk IOPs: /dev/sdu
avg(sdu read) = 0.96 avg(sdu write) = 1.89
Host zm08.stanford.edu: Disk IOPs: /dev/sdd
avg(sdd read) = 0.05 avg(sdd write) = 0.00
Host zm08.stanford.edu: Disk IOPs: /dev/sdo
avg(sdo read) = 0.10 avg(sdo write) = 0.45
Host zm08.stanford.edu: Disk Usage
avg(/opt/zimbra/redo-mysql) = 55.99 avg(/usr/vice/cache) = 13.01 avg(/opt/zimbra/store) = 87.22 avg(/opt/zimbra) = 75.00 avg(/opt/zimbra/hsm1) = 98.00 avg(/) = 8.01 avg(/opt/zimbra/redolog) = 17.72
Host zm08.stanford.edu: Open file descriptor count
avg(total system file descriptors open) = 6396.14 avg(mailboxd file descriptors open) = 3059.57
Host zm08.stanford.edu: Process CPU Time (Top 10 avg)
avg(tripwire) = 1793.00 avg(updatedb) = 31.98 avg(java) = 2320.37 avg(gzip) = 2470.29 avg(mysqld) = 555.81 avg(yum) = 574.00 avg(perl) = 24.77 avg(mysqldump) = 146.75 avg(zmmailboxd) = 1801.04 avg(zmcompresslogs) = 1383.00
Host zm08.stanford.edu: SOAP: Invocation Count: Summary (Top 10 max)
max(MsgActionRequest.move) = 60.00 max(SearchRequest) = 1805.00 max(MsgActionRequest.delete) = 820.00 max(NoOpRequest) = 75.00 max(WaitSetRequest) = 64.00 max(AddMsgRequest) = 181.00 max(GetDomainInfoRequest) = 78.00 max(GetFolderRequest) = 283.00 max(SyncRequest) = 112.00 max(GetAppointmentRequest) = 50.00
Host zm08.stanford.edu: SOAP: Average Call Duration: Summary (Top 10 avg)
avg(SendMsgRequest) = 561.16 avg(CounterAppointmentRequest) = 650.00 avg(DeleteAccountRequest) = 53683.00 avg(BackupQueryRequest) = 332.57 avg(GetAggregateQuotaUsageOnServerRequest) = 952.00 avg(BrowseRequest) = 449.50 avg(SendInviteReplyRequest) = 1668.00 avg(CheckRightsRequest) = 710.00 avg(FolderActionRequest.empty) = 2325.83 avg(GetQuotaUsageRequest) = 1150.00
Host zm08.stanford.edu: MySQL: InnoDB Buffer Pool Pages
avg(pages read) = 340343090.12 avg(pages written) = 119203753.76
Host zm08.stanford.edu: MySQL: InnoDB Buffer Pool Hit Rate
avg(buffer pool hit rate) = 999.76
Host zm08.stanford.edu: MySQL: Database Connections In Use
avg(connections in use) = 0.38
Host zm08.stanford.edu: MySQL: Tables Open/Opened
avg(open_tables) = 1188.61 avg(opened_tables (cumulative)) = 337290.84
Host zm08.stanford.edu: MySQL: Total Slow Queries Count
avg(slow queries (cumulative)) = 518357.87
Host zm08.stanford.edu: Mailboxd: Connection Pool Get Latency
avg(mysql) = 0.21 avg(ldap) = 0.29
Host zm08.stanford.edu: Mailboxd: Lucene IO
avg(Index writes) = 63.89 avg(Index reads) = 92.99
Host zm08.stanford.edu: Mailboxd: LMTP Delivery Throughput
avg(received) = 72.13 avg(delivered) = 43.99
Host zm08.stanford.edu: Mailboxd: LMTP Delivery Rate
avg(received msgs) = 0.46 avg(delivered msgs) = 0.49 avg(received x rcpts) = 0.55
Host zm08.stanford.edu: Mailboxd: Mailbox Add Rate (Delivery Rate)
avg(mailbox add rate) = 1.24
Host zm08.stanford.edu: Mailboxd: Mailbox Add Latency (Delivery Speed)
avg(mailbox add latency) = 44.30
Host zm08.stanford.edu: Mailboxd: Request Rate by Client Protocol
avg(SOAP) = 5.38 avg(IMAP) = 48.42 avg(POP) = 1.61
Host zm08.stanford.edu: Mailboxd: Response Time by Client Protocol
avg(SOAP) = 266.96 avg(IMAP) = 19.28 avg(POP) = 66.10
Host zm08.stanford.edu: Mailboxd: Active Connections by Client Protocol
avg(IMAP) = 107.08 avg(IMAP SSL) = 390.91 avg(POP) = 0.07 avg(POP SSL) = 1.41 avg(SOAP sessions) = 122.43
Host zm08.stanford.edu: Mailboxd: Mailbox Get Count
avg(mailbox get count) = 2731.30
Host zm08.stanford.edu: Mailboxd: Mailbox Get Latency
avg(mailbox get latency) = 0.00
Host zm08.stanford.edu: Mailboxd: Mailbox Cache Hit Rate
avg(mailbox cache hit rate) = 99.98
Host zm08.stanford.edu: Mailboxd: Mailbox Item/Blob Cache Hit Rate
avg(msg blob cache) = 40.13 avg(item metadata cache) = 38.13
Host zm08.stanford.edu: Mailboxd: Minor Garbage Collection Time
avg(minor GC time) = 0.25
Host zm08.stanford.edu: Mailboxd: Major Garbage Collection Time
avg(major GC time) = 0.01
Host zm08.stanford.edu: Mailboxd: Minor Garbage Collection Count
avg(minor GC count) = 5.84
Host zm08.stanford.edu: Mailboxd: Major Garbage Collection Count
avg(major GC count) = 0.01
Host zm08.stanford.edu: Mailboxd: JVM Heap Used
avg(total) = 4869.37 avg(PS Old Gen) = 0.00 avg(CMS Old Gen) = 3964.12 avg(Tenured Gen) = 0.00 avg(Train Gen) = 0.00 avg(PS Eden Space) = 0.00 avg(PS Survivor Space) = 0.00 avg(Par Eden Space) = 802.60 avg(Par Survivor Space) = 102.65 avg(Eden Space) = 0.00 avg(Survivor Space) = 0.00
Host zm08.stanford.edu: Mailboxd: JVM Heap Free
avg(total free) = 2957.94 avg(PS Old Gen free) = 0.00 avg(CMS Old Gen free) = 2056.88 avg(Tenured Gen free) = 0.00 avg(Train Gen free) = 0.00 avg(PS Eden Space free) = 0.00 avg(PS Survivor Space free) = 0.00 avg(Par Eden Space free) = 803.02 avg(Par Survivor Space free) = 98.04 avg(Eden Space free) = 0.00 avg(Survivor Space free) = 0.00
Host zm08.stanford.edu: Mailboxd: JVM Permanent Generation and Code Cache
avg(PS Perm Gen) = 0.00 avg(Perm Gen) = 0.00 avg(CMS Perm Gen) = 137.83 avg(Code Cache) = 35.81 avg(Perm Gen [shared-ro]) = 0.00 avg(Perm Gen [shared-rw]) = 0.00 avg(PS Perm Gen free) = 0.00 avg(Perm Gen free) = 0.00 avg(CMS Perm Gen free) = 113.87 avg(Code Cache free) = 10.82 avg(Perm Gen [shared-ro] free) = 0.00 avg(Perm Gen [shared-rw] free) = 0.00
Host zm08.stanford.edu: convertd: CPU time used
avg(total cputime) = 0.16 avg(user time) = 0.15 avg(system time) = 0.01
Host zm08.stanford.edu: convertd: Resident Memory
avg(convertd rss) = 171.51
Host zm08.stanford.edu: convertd: Processes and Threads
avg(processes) = 5.78 avg(threads) = 5.78
No data available for the following charts:
Host zm08.stanford.edu: Swap Activity
Host zm08.stanford.edu: Disk Throughput: /dev/dm-7
Host zm08.stanford.edu: Disk Throughput: /dev/sdx
Host zm08.stanford.edu: Disk Throughput: /dev/sdab
Host zm08.stanford.edu: Disk Throughput: /dev/sdaa
Host zm08.stanford.edu: Disk Throughput: /dev/sdad
Host zm08.stanford.edu: Disk Throughput: /dev/sdag
Host zm08.stanford.edu: Disk Throughput: /dev/sdaf
Host zm08.stanford.edu: Disk Throughput: /dev/sdy
Host zm08.stanford.edu: Disk Throughput: /dev/sdv
Host zm08.stanford.edu: Disk Throughput: /dev/sdac
Host zm08.stanford.edu: Disk Throughput: /dev/dm-5
Host zm08.stanford.edu: Disk Throughput: /dev/sdw
Host zm08.stanford.edu: Disk Throughput: /dev/sdae
Host zm08.stanford.edu: Disk Throughput: /dev/dm-6
Host zm08.stanford.edu: Disk Throughput: /dev/sdz
Host zm08.stanford.edu: Disk IOPs: /dev/dm-7
Host zm08.stanford.edu: Disk IOPs: /dev/sdx
Host zm08.stanford.edu: Disk IOPs: /dev/sdab
Host zm08.stanford.edu: Disk IOPs: /dev/sdaa
Host zm08.stanford.edu: Disk IOPs: /dev/sdad
Host zm08.stanford.edu: Disk IOPs: /dev/sdag
Host zm08.stanford.edu: Disk IOPs: /dev/sdaf
Host zm08.stanford.edu: Disk IOPs: /dev/sdy
Host zm08.stanford.edu: Disk IOPs: /dev/sdv
Host zm08.stanford.edu: Disk IOPs: /dev/sdac
Host zm08.stanford.edu: Disk IOPs: /dev/dm-5
Host zm08.stanford.edu: Disk IOPs: /dev/sdw
Host zm08.stanford.edu: Disk IOPs: /dev/sdae
Host zm08.stanford.edu: Disk IOPs: /dev/dm-6
Host zm08.stanford.edu: Disk IOPs: /dev/sdz
Host zm08.stanford.edu: Mailboxd: Dirty Lucene Index Writers
Host zm08.stanford.edu: Mailboxd: Lucene IndexWriterCache Hitrate
Host zm08.stanford.edu: nginx: CPU time used
Host zm08.stanford.edu: nginx: Resident Memory
Host zm08.stanford.edu: nginx: Processes and Threads