Stream Processing and Analytics Vasiliki (Vasia) Kalavri
 vkalavri@bu.edu Spring 2020 4/09: Flow control and load shedding ??? Vasiliki Kalavri | Boston University 2020 Keeping up with the producers what if the queue grows larger than available memory? • block the producer (back-pressure, flow control) 2 ??? Vasiliki Kalavri | Boston University 2020 Load management approaches 3 ! Load shedder latency constraints that can tolerate approximate results. Slow down the flow of data: • The system buffers excess data for later processing, once input rates stabilize. • Requires a persistent

Oracle VM VirtualBox R ⃝ User Manual Version 5.2.42 c⃝ 2004-2020 Oracle Corporation http://www.virtualbox.org Contents 1 First steps 12 1.1 Why is virtualization useful? . . . . . . . . . . . . 51 3.4.4 Disk Encryption Tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 3.5 System settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 3.5.1 “Motherboard” properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78 4.8 Guest control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80 3 Contents 4.9 Memory

Oracle VM VirtualBox R ⃝ User Manual Version 5.2.40 c⃝ 2004-2020 Oracle Corporation http://www.virtualbox.org Contents 1 First steps 12 1.1 Why is virtualization useful? . . . . . . . . . . . . . . . 51 3.4.4 Disk Encryption Tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 3.5 System settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 3.5.1 “Motherboard” properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78 4.8 Guest control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80 3 Contents 4.9 Memory

Oracle VM VirtualBox R ⃝ User Manual Version 5.1.32 c⃝ 2004-2018 Oracle Corporation http://www.virtualbox.org Contents 1 First steps 11 1.1 Why is virtualization useful? . . . . . . . . . . . . 48 3.3.3 “Description” tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 3.4 System settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 3.4.1 “Motherboard” properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74 4.8 Guest control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76 4.9 Memory overcommitment

Oracle VM VirtualBox R ⃝ User Manual Version 5.2.34 c⃝ 2004-2019 Oracle Corporation http://www.virtualbox.org Contents 1 First steps 12 1.1 Why is virtualization useful? . . . . . . . . . . . . 51 3.4.4 Disk Encryption Tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 3.5 System settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 3.5.1 “Motherboard” properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78 4.8 Guest control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80 3 Contents 4.9 Memory

Oracle VM VirtualBox R ⃝ User Manual Version 5.2.32 c⃝ 2004-2019 Oracle Corporation http://www.virtualbox.org Contents 1 First steps 12 1.1 Why is virtualization useful? . . . . . . . . . . . . 51 3.4.3 “Description” tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 3.5 System settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 3.5.1 “Motherboard” properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78 4.8 Guest control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80 4.9 Memory overcommitment

Oracle VM VirtualBox R ⃝ User Manual Version 5.1.26 c⃝ 2004-2017 Oracle Corporation http://www.virtualbox.org Contents 1 First steps 11 1.1 Why is virtualization useful? . . . . . . . . . . . . 48 3.3.3 “Description” tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 3.4 System settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 3.4.1 “Motherboard” properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74 4.8 Guest control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76 4.9 Memory overcommitment

Oracle VM VirtualBox R ⃝ User Manual Version 5.1.22 c⃝ 2004-2017 Oracle Corporation http://www.virtualbox.org Contents 1 First steps 11 1.1 Why is virtualization useful? . . . . . . . . . . . . 48 3.3.3 “Description” tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 3.4 System settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 3.4.1 “Motherboard” properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74 4.8 Guest control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76 4.9 Memory overcommitment

Oracle VM VirtualBox R ⃝ User Manual Version 5.1.18 c⃝ 2004-2017 Oracle Corporation http://www.virtualbox.org Contents 1 First steps 11 1.1 Why is virtualization useful? . . . . . . . . . . . . 48 3.3.3 “Description” tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 3.4 System settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 3.4.1 “Motherboard” properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74 4.8 Guest control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76 4.9 Memory overcommitment

Oracle VM VirtualBox R ⃝ User Manual Version 5.1.16 c⃝ 2004-2017 Oracle Corporation http://www.virtualbox.org Contents 1 First steps 11 1.1 Why is virtualization useful? . . . . . . . . . . . . 48 3.3.3 “Description” tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 3.4 System settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 3.4.1 “Motherboard” properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 4.8 Guest control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77 4.9 Memory overcommitment