d******a
发帖数: 32122 | 1 Max Sequential Read
Up to 2050 MBps
Max Sequential Write
Up to 700 MBps |
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发帖数: 1 | 2
Newegg自相矛盾，有个地方说R/W speed up to 730/660MB/s，Specifications tab里
说：
Performance
Max Sequential Read
Up to 1000 MBps
Max Sequential Write
Up to 800 MBps
官网上说 1000/800, 但和三星比还是很慢
http://www.xpg.com/us/feature/500 |
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c********r
发帖数: 649 | 3 13 WD3000BLFS 300GB Hard Drive $152 $1,976
1 SC216A-R900LPB 24 Bay Chassis $785 $785
1 SUPERMICRO X8DTL-iF Motherboard $305 $305
1 Intel Xeon E5620 CPU $395 $395
1 Patriot Signature 12GB (3 x 4GB) $429 $429
2 SAS3081E-R SAS HBA $190 $380
1 Supermicro SNK-P0038P Heatsink $20 $20
0 Intel x25-e SSD $349 $0
2 2.5 HARD DRIVE $50 $100
$4,390
4 x 3 RaidZ
1 x Raid Mirr... 阅读全帖 |
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t****t
发帖数: 6806 | 4 inserter() returns a insert_iterator, which calls container.insert() each
time insert_iterator::operator= is called. The begin() is stored in the
insert_iterator. Thus it has limitations. For some sequential containers,
such as vector, insert() may invalidate the calculated (only once) begin(),
so it could be undefined.
back_inserter() returns a back_insert_iterator, which calls container.push_
back() each time back_insert_iterator::operator= is called. Thus it only
works for sequential containe |
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o**2
发帖数: 168 | 5 这个参数 3 涉及了FMP的重要概念，就是active object。在FmpMain里面"calculator"
就是一个active object。FMP对调用和被调用的objects来说，都是no thread的，当然
messenger属于FMP系统object，最后还是要用thread来实现active object的。
FMP赋予了active object并发的语义：一个activeobject可以是一个single worker（
就是sequential programming）；也可以是一个team of workers（就是多个独立的
sequential programming）。所以这个 3 是head count的意思。
在computeDijkstraFormula（）里，每次调用"calculator:multiply" 3次，也就是说
这个算法的最大并发数是 3。于是参数 1 等于单个worker； 2 等于 a team of 2
workers； 速度也随之增快。但超过 3 之后，就不能在加快了。
对于调用和被调用的objects来说，这都是透明的... 阅读全帖 |
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J*****n
发帖数: 4859 | 6 I have a class and its derived class
[Serializable(), StructLayout(LayoutKind.Sequential)]
class A{DateTime i}
[Serializable(), StructLayout(LayoutKind.Sequential)]
class B : A {Int32 j}
List p = new List();
Now, I add three element in the p and then serilize p into a binary file
called out.bin.
Now, I would get the third element in the p from the out.bin without reading
the first two elements.
using (BinaryReader reader = new BinaryReader(File.Open("out.bin", FileMode.
Open)))
{
Int32 len... 阅读全帖 |
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T********i
发帖数: 2416 | 7 一个大型系统必须有一个failover的完整方案。近日讨论中发现，网友在这个问题上多
存误解。而且很多错误认识竟然大行其道。
为再次避免谬种流传，不敢自匿，特公诸于众：
其实，这里面每一个事实，我都已经于多天前提到了。
Complete Failover Handbook
废话少说，failover方案一般2种
1. 同步写盘
2. 同步写网络（必须等ACK）
其他还有一些组合，比如异步写盘+同步写网络等等
现在看看同步写盘：
普通磁盘：
这个其实最复杂，为什么。因为我说过，磁头seek 5-8ms，转速4500-15000 RPM。
文件系统不好做就是要为磁盘做优化。因为磁盘的寻道seek太慢，因此尽量让文件水平
放置在磁道上。因为顺序读写sequential最普遍。磁盘转速太高sector扇区的编码还要
隔开。这样读完一个扇区OS发请求的间隔时间内，刚好转到下一个扇区。
同步写盘因为到达时间随机，基本上需要平均等半圈，这样平均按照15000 RPM算就是
15000 / 60 × 2 = 500次每秒。实际上数量应比这个低因为会seek。
当然如果sequential不间断同步写盘... 阅读全帖 |
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d******c
发帖数: 2407 | 8 The Landscape of Parallel Computing Research - UC Berkeley EECS
1. Old CW: Power is free, but transistors are expensive.
· New CW is the “Power wall”: Power is expensive, but transistors are “
free”. That
is, we can put more transistors on a chip than we have the power to turn on.
2. Old CW: If you worry about power, the only concern is dynamic power.
· New CW: For desktops and servers, static power due to leakage can be 40%
of
total power. (See Section 4.1.)
3. Old CW: Monolithic uniprocessors ... 阅读全帖 |
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b*****k
发帖数: 20 | 9 according your problem, you need solve this by a sequential program. Plus
sequential programming is good enough for it.
不
。
程 |
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S******e
发帖数: 393 | 10 想用SalI-NheI double digetion,
NEB suggest sequential,
但我看到SalI和EcoRI double digestion 用 E.coRI buffer
NheI 和 EcoRI double digestion 也用E.coRI buffer
是不是SalI-NheI double digestion 就可以用E.coRI buffer，
而不用sequential了？
多谢回答！ |
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r********n
发帖数: 7441 | 11 取决于你的问题是否是convex的，如果是，用lagrangian可以建立解得sufficient &
necessary condition，或者CPLEX直接可以求解;如果不是convex program，你只能求
出所有stationary point，然后比较，一般用sqp (sequential QP) 或者slp (
sequential LP) |
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T******T
发帖数: 3066 | 12 As general note in synchronous digital design, unless clock rate is slow and
absolutely necessary, refrain from using double edged sequential logic. I
would only use it for fast <-> real slow time domain synchronization related
stuff.
DDR sounds cool, and it might seem efficient as hell to be able to
accomplish twice as much operation in only 1 single clock cycle, but when it
comes time to backend STA timing closure, you'll regret not having that
extra slack to deal with worst path circuit delay... 阅读全帖 |
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s*****n
发帖数: 2174 | 13 你这问题问的本身就很模糊, 根本看不明白.
什么是 resource, 什么是 N, 你这个实验
到底是run in parrellel 还是 sequential.
你一开始所谓的 succ rate 应该指的是单次的成功率.
可是最后考虑的succ rate, 又是sequential experiments
恰好在第N+1次首次成功的概率. 这都是完全不相关
的概念.
如果就是想 知道 什么样的N能够使得
(1-a)^N * a = 0.95,
那么取一下log不就行了吗? |
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o****o
发帖数: 8077 | 14 small look up in huge master table, I always bet on hash table, you will
then do a sequential read on the master which is the fastest way comparing
to other methods that involves non-sequential read over multiple tables |
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k*****u
发帖数: 1688 | 15 怎么觉得像sequential的问题？
美丑一次就检查一下，小雨m，继续抽样，直到到了m为止。 sequential test是不是就是这么做的？以前学的东西都忘了
你说不是ｍ就扔掉，这样太浪费了吧 |
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k*****u
发帖数: 1688 | 16 怎么觉得像sequential的问题？
美丑一次就检查一下，小雨m，继续抽样，直到到了m为止。 sequential test是不是就是这么做的？以前学的东西都忘了
你说不是ｍ就扔掉，这样太浪费了吧 |
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d******9
发帖数: 404 | 17 Usually, Data Step uses sequential reading to input data, the automatic
variable END=0 in the process. It will give a signal when no more record to
load in, the automatic variable END=1 then.
However, if you specify the POINT=varibale_name, SAS will then read in data
by random order than by sequential order, then it can not detect the end of
a file any more. In this case you need use a STOP statement to finish the
iterations. |
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V***b
发帖数: 3419 | 18 如果一定要比twin-turbo和single turbo哪个好，那还是twin-turbo好。同样的流量，
twin-turbo转动惯量小（这是个很显然的问题，其实不用计算），所以turbo lag就小
。以前排量大一点的引擎 (2.5-3L) 因为这个原因都会采用twin-turbo.
BMW N55是第一个3L引擎用single turbo的，因为材料和工艺的进步single-turbo就能
达到预期的效果（增压值，lag），BMW就省点成本不用twin-turbo了，所以网上一帮宝
马粉丝把N54和N55比半天也是不相上下。
但M3/4就不一样了，需要的增压值大了很多，为了不让lag太大，BMW就又用回twin-
turbo了。
其实twin-turbo是个很传统的技术，高端一些的是sequential twin-turbo和2-stage
twin-turbo，BMW认为现在这个M3/4需要的性能twin-turbo就行了。
目前最牛的turbo是sequential 2-stage tri-turbo, 用在M550d上的那个，一个3L柴油
机升输出127hp了，而且没有l... 阅读全帖 |
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w*******y
发帖数: 60932 | 19 Haven't seen this posted up yet, so here goes!
Link:
http://eshop.macsales.com/shop/internal_storage/Mercury_Extreme_SSD_Sandforce
Other World Computing has their Mercury Extreme family line of SSDs. They
have a promotion on their 40 GB SSD drives for only $99.
Some highlights:
SandForce Processor with full SF1200 Series 7% Over Provisioning firmware
set
9.5 mm 2.5" size
Sustained Sequential Read: up to 285MB/s
Sustained Sequential Write: up to 275MB/s
3 Year Warranty
Looks like the deal with ex |
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w*******y
发帖数: 60932 | 25 Crucial 2.5 inch 64GB RealSSD C300 SATA3 Solid State Drive (MLC) -
CTFDDAC064MAG-1G1:
http://www.superbiiz.com/detail.php?name=CTFDDAC64G&show=r
Use coupon HELLO2011 for $15 off. Final price is $104.99 with free shipping.
Crucial 2.5 inch 64GB RealSSD C300
Mfr Part Number: CTFDDAC064MAG-1G1
Capacity: 64 GB
Form Factor: 2.5 inch
Interface: SATA3
NAND Flash: MLC
Controller: Marvell
Firmware: Field Upgradeable
Performance:Sequential Read Rate: 355 MB/s (max)
Sequential Write Rate: 70 MB/s (max)
Ran... 阅读全帖 |
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w*******y
发帖数: 60932 | 26 The Crucial 64GB C300 is BACK IN STOCK!
This is a chance for those who missed the $15 dollar off coupon that made
this $105 5 days ago (1/8/10)
The coupon I used was HIBERNATE10 to save $10
Crucial 2.5 inch 64GB RealSSD C300 SATA3 Solid State Drive (MLC) -
CTFDDAC064MAG-1G1
It has been out of stock from the last coupon til yesterday. I'm pretty sure
its gona happen again as this is just a $5 difference from last week.
For those of you who don't know about this ssd, it rocks.
Crucial 2.5 inch 64G... 阅读全帖 |
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w*******y
发帖数: 60932 | 27 Kingston SSDNow V Series SNV425-S2/128GB 2.5" 128GB SATA II Internal Solid
State Drive (SSD)
149.99 After Rebate+ Free Shipping
Sequential Access - Read
up to 200MB/s
Sequential Access - Write
up to 110MB/s
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w*******y
发帖数: 60932 | 28 Costco.com has the Kingston V100 64GB SSD for $70 after a $30 MIR. After
searching, it's the best price here on SD.
Link:
Link:
http://www.costco.com/Browse/Product.aspx?Prodid=11613187&whse=
(3 year warranty)
Features:
Performance enhances productivity; makes users more efficient
Innovative 2.5" form factor; uses NAND Flash memory components
Silent runs silent and cool with no moving mechanical parts
Reliable less likely to fail than a standard hard drive
Shock-Resistant... 阅读全帖 |
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w*******y
发帖数: 60932 | 29 Newegg is having a "spring cleaning" of their Harddrives.. here's a great
deal on a 128GB SSD.. perfect 5 star review with free shipping.. TAX only in
CA
Crucial RealSSD C300 CTFDDAC128MAG-1G1 2.5" 128GB SATA III MLC Internal
Solid State Drive (SSD)
General
Brand
Crucial
Series
RealSSD C300
Model
CTFDDAC128MAG-1G1
Device Type
Internal Solid State Drive (SSD)
Used For
Consumer
Architecture
MLC
Expansion / Connectivity
Form Factor
2.5"
Capacity
128GB
Interface Type
... 阅读全帖 |
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w*******y
发帖数: 60932 | 30 Buy.com has this for $249.95:
Link:
http://www.buy.com/prod/intel-ssdsc2mh120a2k5-510-series-120gb-
Most retailers have this closer to $300. I saw on SD that MWave had this at
$272 recently, so this seems to be a very good deal on an Intel SSD.
This is the 510 series, which is Intel's performance class (as opposed to
the new 320 Series).
Tech Specs via Buy.com:
Model Name: Intel Solid-State Drive 510 Series
Capacity: 120GB
NAND Flash Memory: 34nm Intel NAND Flash Memory Multi-Level Cell Compute-... 阅读全帖 |
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w*******y
发帖数: 60932 | 31 Link:
http://www.newegg.com/Product/Product.aspx?Item=N82E16820227550
OCZSSD2-2VTXE60G is the model number
General
Brand
OCZ
Series
Vertex 2
Model
OCZSSD2-2VTXE60G
Device Type
Internal Solid State Drive (SSD)
Used For
Consumer
Architecture
MLC
Expansion / Connectivity
Form Factor
2.5"
Capacity
60GB
Interface Type
SATA II
Features
Sustained Write: up to 250 MB/s
4k Random Write (Aligned): 50,000 IOPS
Seek Time: 0.1 MS
TRIM (requires OS support)
... 阅读全帖 |
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w*******y
发帖数: 60932 | 33 Corsair Force Series 3 CSSD-F120GB3-BK 2.5" 120GB SATA III Internal Solid
State Drive (SSD)
$25 off with promo code HARDOCPX6X1A, ends 6/7
Link:
http://www.newegg.com/Product/Product.aspx?Item=N82E16820233181
Sequential Access - Read:
Up to 550 MB/s
Sequential Access - Write:
Up to 510 MB/s
Power Consumption (Active):
2W
Power Consumption (Idle):
0.5W
Max Shock Resistance:
1500G
Used For:
Consumer
Features:
Random Write 4K: 85,000 IOPS (Aligned) S.M.A.R.T. Support Ste... 阅读全帖 |
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w*******y
发帖数: 60932 | 34 Hey everyone first post and I thought this was good enough!
I think this is the cheapest price ever for the Crucial M4 256GB SSD.
Newegg is having a sale on the Crucial SSD's with the same coupon code for
all of them.
I was able to add more than 1 Crucial SSD to my order and got the right
discount on all of them combined. However, I noticed when I tried to make a
new order the coupon won't work anymore, so buy what you need.
Item: Crucial M4 CT256M4SSD2 2.5" 256GB SATA III MLC Internal Solid Sta... 阅读全帖 |
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w*******y
发帖数: 60932 | 36 Crucial M4 CT064M4SSD2CCA 2.5" 64GB SATA III MLC Internal Solid State Drive
(SSD) with Transfer Kit:
http://www.newegg.com/Product/Product.aspx?Item=N82E16820148447
General
Brand
Crucial
Series
M4
Model
CT064M4SSD2CCA
Device Type
Internal Solid State Drive (SSD)
Used For
Consumer
Physical
Form Factor
2.5"
Capacity
64GB
Memory Components
MLC
Interface
SATA III
Width
3.95"
Depth
2.75"
Height
0.37"
Weight
0.17 lbs.
Performance
Sustained Sequential... 阅读全帖 |
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w*******y
发帖数: 60932 | 39 For those of us who hate rebates.
Mushkin Enhanced Chronos MKNSSDCR120GB 2.5" 120GB SATA III MLC Internal
Solid State Drive (SSD):
http://www.newegg.com/Product/Product.aspx?Item=N82E16820226236
Physical
Form Factor 2.5"
Capacity 120GB
Memory Components MLC
Interface SATA III
Controller SandForce SF-2281
Width 100.2mm
Depth 9.3mm
Height 70mm
Weight 79g
Performance
Max Sequential Read Up to 550MB/s
Max Sequential Write Up to 515MB/s
4KB Random Write Up to 90,000 IOPS
Seek Time 0.1 ms
MTBF 2,000,0... 阅读全帖 |
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w*******y
发帖数: 60932 | 41 First time posting!
Saw this while browsing around Amazon and didn't see it posted:
Link:
http://www.amazon.com/Plextor-2-5-Inch-Solid-State-PX-64M2S-02/
Brand
Plextor
Series
PX-M2 Series
Model
PX-64M2S
Device Type
Internal Solid State Drive (SSD)
Physical
Form Factor
2.5"
Capacity
64GB
Memory Components
MLC
Interface
SATA III
Performance
Sustained Sequential Read
370MB/s
Sustained Sequential Write
110MB/s
MTBF
1,500,000 hours
Features
Features
128MB DDR3 Cache
Random Read (IOPS 4K): 15,000
R... 阅读全帖 |
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w*******y
发帖数: 60932 | 42 Intel 320 Series 160GB (G3K5) 2.5" SATA II MLC Internal Solid State Drive $
165 AR shipped @ Amazon
SSDSA2CW160G3K5
2.5"
160GB
SATA II
$254.99 - $ 90.00 rebate = $164.99 shipped
Link:
http://www.amazon.com/gp/product/B004UG3YU8
5 years warranty
270 MB/s sequential read
165 MB/s sequential write
MTBF: 1,200,000 hours
SSD in ESD Bag with security label. 3.5" desktop bracket with screws and
screwdriver. Desktop cloning kit. CD, "speed demon" sticker, installation
instructions. 5-pack "over-pack " b... 阅读全帖 |
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