This document discusses different types of computer memory, including RAM, ROM, and virtual memory. It describes the key characteristics and uses of dynamic RAM, static RAM, ROM, EEPROM, flash memory, cache memory, and virtual memory. The main types of RAM discussed are DRAM, SRAM, SDRAM, and RDRAM. DRAM needs refreshing but is cheaper than SRAM. ROM types include mask ROM, PROM, EPROM, and EEPROM. Virtual memory allows programs to access memory as if it were one unified virtual space.
This slide contains information about Memory and its parameters,Classification of memory, Allocation policies, cache memory, Virtual memory, Paging, Segmentation and pipelining
This slide contains information about Memory and its parameters,Classification of memory, Allocation policies, cache memory, Virtual memory, Paging, Segmentation and pipelining
RAM(Random Access memory) is a volatile memory.RAM is our working memory storage. All the data, which the PC uses and works with during operation, are stored here. Data are stored on drives, typically the hard drive. However, for the CPU to work with those data, they must be read into the working memory storage, which is made up of RAM chips.
Historical review:
Back in the 80's, PC's were equipped with RAM in quantities of 64 KB, 256 KB, 512 KB and finally 1 MB. Around 1990, advanced operating systems, like Windows, appeared on the market, that started the RAM race. The PC needed more and more RAM. That worked fine with the 386 processor, which could address larger amount of RAM. The first Windows operated PC's could address 2 MB RAM, but 4 MB soon became the standard. The race has continued through the 90's, as RAM prices have dropped dramatically. Today it would be foolish to consider less than 64 MB RAM in a PC. The OS like windows Xp requires better than this.
The data storing capacity of a digital device is known as memory.
Memory of device like empty pages of note book.
Memory devices enables us to retrieve the stored data from the memory.
Examples are HDD, CD, DVD, pen drive, floppy disk, memory cards.
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The Earth System Grid Federation (ESGF) is a global network of data servers that archives and distributes the planetâs largest collection of Earth system model output for thousands of climate and environmental scientists worldwide. Many of these petabyte-scale data archives are located in proximity to large high-performance computing (HPC) or cloud computing resources, but the primary workflow for data users consists of transferring data, and applying computations on a different system. As a part of the ESGF 2.0 US project (funded by the United States Department of Energy Office of Science), we developed pre-defined data workflows, which can be run on-demand, capable of applying many data reduction and data analysis to the large ESGF data archives, transferring only the resultant analysis (ex. visualizations, smaller data files). In this talk, we will showcase a few of these workflows, highlighting how Globus Flows can be used for petabyte-scale climate analysis.
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Large Language Models (LLMs) are currently the center of attention in the tech world, particularly for their potential to advance research. In this presentation, we'll explore a straightforward and effective method for quickly initiating inference runs on supercomputers using the vLLM tool with Globus Compute, specifically on the Polaris system at ALCF. We'll begin by briefly discussing the popularity and applications of LLMs in various fields. Following this, we will introduce the vLLM tool, and explain how it integrates with Globus Compute to efficiently manage LLM operations on Polaris. Attendees will learn the practical aspects of setting up and remotely triggering LLMs from local machines, focusing on ease of use and efficiency. This talk is ideal for researchers and practitioners looking to leverage the power of LLMs in their work, offering a clear guide to harnessing supercomputing resources for quick and effective LLM inference.
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4. Semiconductor Memory
ī´ RAM
ī´ Misnamed as all semiconductor memory is random access
ī´ Read/Write
ī´ Volatile
ī´ Temporary storage
ī´ Static or dynamic
5. RAM
(Random Acess Memory)
Perangkat random-access memungkinkan disimpan data
yang dapat diakses secara langsung dalam urutan acak.
Main Memory
6. Jenis RAM
Dynamic RAM (DRAM)
Synchronous
DRAM (SDRAM)
Rambus DRAM (RDRAM)
Extended Data Output RAM
(EDORAM)
Static Random Acess Memory
Double Data Rate SDRAM (DDR SDRAM)
Main Memory
7. Dynamic RAM
ī´ Bits stored as charge in capacitors
ī´ Charges leak
ī´ Need refreshing even when powered
ī´ Simpler construction
ī´ Smaller per bit
ī´ Less expensive
ī´ Need refresh circuits
ī´ Slower
ī´ Main memory
ī´ Essentially analogue
ī´ Level of charge determines value
8. DRAM Operation
ī´ Address line active when bit read or written
ī´ Transistor switch closed (current flows)
ī´ Write
ī´ Voltage to bit line
ī´ High for 1 low for 0
ī´ Then signal address line
ī´ Transfers charge to capacitor
ī´ Read
ī´ Address line selected
ī´ transistor turns on
ī´ Charge from capacitor fed via bit line to sense amplifier
ī´ Compares with reference value to determine 0 or 1
ī´ Capacitor charge must be restored
9. Static RAM
ī´ Bits stored as on/off switches
ī´ No charges to leak
ī´ No refreshing needed when powered
ī´ More complex construction
ī´ Larger per bit
ī´ More expensive
ī´ Does not need refresh circuits
ī´ Faster
ī´ Cache
ī´ Digital
ī´ Uses flip-flops
10. Static RAM Operation
ī´ Transistor arrangement gives stable logic state
ī´ State 1
ī´ C1 high, C2 low
ī´ T1 T4 off, T2 T3 on
ī´ State 0
ī´ C2 high, C1 low
ī´ T2 T3 off, T1 T4 on
ī´ Address line transistors T5 T6 is switch
ī´ Write â apply value to B & compliment to B
ī´ Read â value is on line B
11. SRAM v DRAM
ī´ Both volatile
ī´ Power needed to preserve data
ī´ Dynamic cell
ī´ Simpler to build, smaller
ī´ More dense
ī´ Less expensive
ī´ Needs refresh
ī´ Larger memory units
ī´ Static
ī´ Faster
ī´ Cache
12. Advanced DRAM Organization
ī´ Basic DRAM same since first RAM chips
ī´ Enhanced DRAM
ī´ Contains small SRAM as well
ī´ SRAM holds last line read (c.f. Cache!)
ī´ Cache DRAM
ī´ Larger SRAM component
ī´ Use as cache or serial buffer
13. Synchronous DRAM (SDRAM)
ī´ Access is synchronized with an external clock
ī´ Address is presented to RAM
ī´ RAM finds data (CPU waits in conventional DRAM)
ī´ Since SDRAM moves data in time with system clock, CPU
knows when data will be ready
ī´ CPU does not have to wait, it can do something else
ī´ Burst mode allows SDRAM to set up stream of data and fire
it out in block
ī´ DDR-SDRAM sends data twice per clock cycle (leading &
trailing edge)
14. RAMBUS
ī´ Adopted by Intel for Pentium & Itanium
ī´ Main competitor to SDRAM
ī´ Vertical package â all pins on one side
ī´ Data exchange over 28 wires < cm long
ī´ Bus addresses up to 320 RDRAM chips at 1.6Gbps
ī´ Asynchronous block protocol
ī´ 480ns access time
ī´ Then 1.6 Gbps
15. DDR SDRAM
ī´ SDRAM can only send data once per clock
ī´ Double-data-rate SDRAM can send data twice per clock
cycle
ī´ Rising edge and falling edge
16. Cache DRAM
ī´ Mitsubishi
ī´ Integrates small SRAM cache (16 kb) onto generic DRAM
chip
ī´ Used as true cache
ī´ 64-bit lines
ī´ Effective for ordinary random access
ī´ To support serial access of block of data
ī´ E.g. refresh bit-mapped screen
ī´CDRAM can prefetch data from DRAM into SRAM buffer
ī´Subsequent accesses solely to SRAM
17. Read Only Memory (ROM)
ī´ Permanent storage
ī´ Nonvolatile
ī´ Microprogramming (see later)
ī´ Library subroutines
ī´ Systems programs (BIOS)
ī´ Function tables
18. ROM
(Read Only Memory)
ROM ini sifatnya permanen, artinya program / data yang disimpan di dalam
ROM ini tidak mudah hilang atau berubah walau aliran listrik di matikan.
Salah satu contoh ROM adalah ROM BIOS yang berisi program dasar
system komputer yang mengatur / menyiapkan semua peralatan /
komponen yang ada dalam komputer saat komputer dihidupkan.
Main Memory
19. Types of ROM
ī´ Written during manufacture
ī´ Very expensive for small runs
ī´ Programmable (once)
ī´ PROM
ī´ Needs special equipment to program
ī´ Read âmostlyâ
ī´ Erasable Programmable (EPROM)
ī´ Erased by UV
ī´ Electrically Erasable (EEPROM)
ī´ Takes much longer to write than read
ī´ Flash memory
ī´ Erase whole memory electrically
20. Organisation In Detail
ī´ A 16Mbit chip can be organised as 1M of 16 bit words
ī´ A bit per chip system has 16 lots of 1Mbit chip with bit 1 of each word in
chip 1 and so on
ī´ A 16Mbit chip can be organised as a 2048 x 2048 x 4bit array
ī´ Reduces number of address pins
ī´ Multiplex row address and column address
ī´ 11 pins to address (211=2048)
ī´ Adding one more pin doubles range of values so x4 capacity
21. Refreshing
ī´ Refresh circuit included on chip
ī´ Disable chip
ī´ Count through rows
ī´ Read & Write back
ī´ Takes time
ī´ Slows down apparent performance
22. Interleaved Memory
ī´ Collection of DRAM chips
ī´ Grouped into memory bank
ī´ Banks independently service read or write requests
ī´ K banks can service k requests simultaneously
23. Error Correction
ī´ Hard Failure
ī´ Permanent defect
ī´ Soft Error
ī´ Random, non-destructive
ī´ No permanent damage to memory
ī´ Detected using Hamming error correcting code
24. Jenis ROM
Mask ROM
Programmable Read Only Memory
(Eraseable Programmable Read Only Memory)
EPROM
Electrically Erasable Programmable Read Only Memory
Main Memory
25. CMOS
(Complementary Metal Oxide Semiconductor)
Suatu memori yang khusus yang berisi data
vital mengenai konfigurasi komputer dan
bersifat semi-permanen.
Main Memory
26. Virtual Memory
Teknik manajemen memori yang dikembangkan untuk kernel
multitugas.
Memungkinkan sebuah program harus dirancang seolah-olah
hanya ada satu jenis memori, memori "virtual", yang bertindak
secara langsung beralamat memori baca/tulis (RAM).
Main Memory
27. Refference
Stalling, William, Computer Organization
and Architecture, 10th Edition, Pearson,
2015
Abdurohman, Maman, Organisasi dan
Arsitektur Komputer revisi ke-4, Penerbit
Informatika, 2017