mm class 8

50 %
50 %
Information about mm class 8

Published on June 26, 2007

Author: BAWare


Service Models:  Service Models Example Server has 50 movies, 100 min. each Request rate: 1 movie/min Max. capacity: 20 streams Random Access Model Case 1: after 20 movies, no more memory left. 21st movie waits for 80 minutes, 22nd movie waits for 81 minutes … Case 2: after 20 movies, more memory can be allocated. 21st movie has to wait (initial latency) till one round of the previous 20 movies each has been served. EPPV Model: At any time 20 movies are served, movies are initiated every 5 minutes Streams are distributed uniformly during these 20 minutes A Disk Striping Model:  A Disk Striping Model Assume compressed videos stored on m disks with stripe units of size d – each round gets 1 stripe unit Period P for a video: # rounds to get successive streams q = max. number of videos serviced in a round / disk If total memory=R Optimal d given by: If R=2GB, m=50, display rate=1.5Mbps d=0.9Mb, q=20, round=600ms Period for a video of 100 min = 1 min. round duration buffer/video is 2d tseek= avg. time to reach a track Vertical Striping:  Vertical Striping A situation 4 supervideos V1 .. V4 V1, V2: 3 stripe units per disk V3, V4: 2 stripe units per disk 2 stripe units/round/disk Round 1..3: get data for V1 and V2 from disk 0 Round 4, 5: get data for V3 and V4 from disk 0 get data for V1 and V2 from disk 1 Round 6: get data for V1 and V2 from disk 1 get data for V3 and V4 from disk 1 4 streams from a disk!!! A solution Partition videos into sets that reduce the difference between the lengths of videos of any two sets as much as possible Scheduling for Vertical Striping:  Scheduling for Vertical Striping The Problem: Get w stripe units for every super video Vi at intervals of Pi from disk 0, when a maximum of q streams can be retrieved from a disk in one round Schedule non-preemptible tasks T1…Tr with periods P1…Pr and computation time w on q processors How complex is the problem? What can be done? Result 1: if n.w  gcd(P1…Pn) then the tasks are schedulable on a single processor, where n=r/q If tasks T1..T4 have periods 4,4,6,6 and w=1, they can be scheduled at 0,2,1,3 respectively – a stronger result is needed Example:  Example Tasks T1..T4 have periods 4,4,6,6 and w=1 g=2 n=4, so n andgt; g Make tasks T1…T4 with periods 2, 2, 3, 3 Initial subsets S1=T1, T2 S2=T3, T4 Next iteration: From S1: {(T1, 0) (T2, 1)} From S2: {(T3, 0) (T4, 1)} Step 5: {(T1, 0) (T2, 2) (T3, 1) (T4, 3)}

Add a comment

Related presentations

Related pages

Mercedes-Benz M-Class - Wikipedia, the free encyclopedia

Mercedes-Benz M-Class; Overview; Manufacturer: Mercedes-Benz: Also called: ... Hybrid: 1,980 mm (77.8 in) Height: 1,796 mm (70.7 in) AMG: 1,860 mm (73.3 in)
Read more

SD-Karte – Wikipedia

Logo der SD-Karte: Allgemeines; Typ: Halbleiterspeicher: Kapazität: SD: 8 MB bis 2 GB SDHC: 4 GB bis 32 GB SDXC: 48 GB bis max. 2 TB: Größe: SD: 32,0 mm ...
Read more

Meterware Kathrein LCD 111 A+ Koax Kabel RG6, weiß, PVC ...

Meterware Kathrein LCD 111 A+ Koax Kabel RG6, weiß, PVC, Class A+ (1,13/4,8/6,9 mm)
Read more

Sat Kabel - ClassA / Class A++ / 120dB / Twin Kabel ...

Transmedia KH120-M Koaxialkabel Sat Kabel HIGH Class A, Meterware, 8.2 mm, 120 dB. Modell: KH120-M; SKU: XM587; Neu 4.7 3 Kundenrezensionen; sofort ...
Read more

Mercedes-Benz B-Class - Wikipedia, the free encyclopedia

Mercedes-Benz B-Class; Overview; Manufacturer: Daimler AG: ... 2,786 mm (109.7 in) 2009-11: 2,779 mm ... the B180 CDI uses the OM651 1.8 common rail diesel
Read more

microSD – Wikipedia

11,0 mm × 15,0 mm ... Class 2: 16 Mbit/s ... Da auch das bei SDHC gemäß Standard verwendete Dateisystem FAT32 Partitionsgrößen bis 8 TB ...
Read more

Cindy 8 mm. Class 4 & fire-resistant

Satin stainless steel Lever fixed on steel understructure without lugs Spring suited for multipoint locks Oval rose 72 x 33 x 12 mm Order spindle ...
Read more

Mathe Klassenarbeit - Maßeinheiten - ...

Klasse 8. Klasse 9. Klasse 10. Klasse 11. Oberstufe. Vokabeltrainer. Lehrersprüche. ... 0,0046 < 4,6 cm < 460 mm < 0,046 km. b) (1) 19 € > 1.879 Cent (2
Read more

Umrechnen von Längenmaßen - Rechnen mit Größen ...

1 cm = 10 mm: Mit dem Button Neue Aufgabe stellen kannst du dir jeweils eine Aufgabe stellen lassen.
Read more