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💫 Summary
DMIPS is a performance parameter that measures the execution of a standard program by a CPU, while MIPS measures the execution of millions of instructions per second; DMIPS is more accurate and widely used despite its defects, and DMIPS per megahertz is useful for comparing performance at different clock speeds.
✨ Highlights📊 Transcript
DMIPS is a measure of computer performance related to the performance of the DEC VAX 11780 computer, used as a reference to measure the performance of other CPUs in the market.
00:00
DMIPS is a measure of computer performance.
It is related to the performance of the DEC VAX 11780 computer.
Used as a reference to measure the performance of other CPUs in the market.
DMIPS is different from MIPS and understanding the difference helps in understanding DMIPS.
DMIPS and MIPS are performance parameters that measure the number of instructions executed by a processor, with DMIPS specifically measuring the execution of a standard loop of synthetic code.
01:17
MAP stands for millions of instructions per second by a CPU or core.
DMIP stands for dry stone million instructions per second, which measures how many times a standard loop of synthetic code was executed by the CPU.
MIPS measures the number of instructions executed by the processor in one second.
DMIPS measures the execution of a standard loop of synthetic code by the processor.
DMIPS is a performance parameter that measures the speed of executing instructions, and it varies depending on the architecture of the core.
02:34
DMIPS value may vary based on the cycle to execute an instruction.
It can vary on different architectures like CISC or RISC.
DMIPS is measured by executing a standard program called "dry stone" which consists of a loop of instructions.
An example is given where a 100 MHz CPU that completes the benchmark program 200 times faster than the DEC VAX 1170 would be considered a 200 DMIPS machine.
MIPS is less reliable for measuring computer performance as it is architecture dependent.
DMIPS is a widely used method to measure performance, providing simplicity and accuracy in determining the speed and work done by a CPU.
03:55
DMIPS measures the actual work done by the CPU, while MIPS measures the speed of execution of a particular instruction.
D-MIPS per megahertz is obtained by dividing the result of DMIPS calculation by the frequency of the CPU, allowing for performance comparison at different clock speeds.
DMIPS indicates the number of times a dry stone program or standard program is executed by any CPU.
00:00hi welcome back to the course in the
00:02last lecture we have checked about the
00:04performance parameter
00:06of the rl78 which is a
00:09d mips and d mips per megahertz
00:14so what actually the dmips is and what
00:17is the difference between the mips
00:19and the mips in measuring the
00:21performance of the cpu
00:24and why we use d maps per megahertz
00:27for the performance of the core so let's
00:29go through this session
00:31to find all the answers about this
00:33question
00:34so what actually that demips is
00:37according to the definition of demips a
00:39dmips is the measure of
00:41computer performance related to the
00:44performance of the
00:46dec vex 11780 computer
00:49of the 1970s basically they have made a
00:53reference
00:54of this mini computer to measure the
00:56performance
00:57of the other available cpus in the
00:59market
01:00it can be rl 78 it can be arm
01:04it can be x86 now
01:07let's take a look at the difference
01:09between the mips and dmips
01:11if we can understand the difference
01:13between the maps and d maps
01:15it becomes easy to understand the dmips
01:17parameter
01:18so the first point is a map stands for
01:22the execution of
01:23millions instruction per second by a cpu
01:27or core on the other hand the dmip
01:30stands for
01:31dry stone million instruction per second
01:35the dry stone is basically a standard
01:37program
01:38how many times this dry stone program
01:41was executed by the cpu that value
01:45becomes
01:46the dmips so mips tells us how many
01:49instructions
01:50are executed by the processor in one
01:53second
01:56on the other hand the dmips tells us not
01:59only the execution of a particular
02:01instruction execution
02:03instead how many times
02:07a standard loop of synthetic code which
02:10we call
02:10dry stone has been executed by the
02:13processor
02:14now let's take an example for mips
02:18if we measure maps by executing nope
02:21instruction
02:22which is a no operation instruction in
02:24assembly
02:25then it may produce one value
02:28of mips on the other hand if we
02:31execute the other instructions like
02:34move or ldr then
02:37mips value may vary because the cycle
02:41to execute that instruction may vary
02:45according to the architecture of the
02:48core
02:49it may vary on the cisc architecture it
02:52may vary on the risk architecture
02:55on the other hand the dry stone is a
02:57standard program
02:58with mixed instructions and it measures
03:01performance by executing one loop of
03:04instructions
03:06available in that standard program
03:09the standard program was written for the
03:12dec wax 11780 of mini computer which we
03:16call
03:17dry stone as we discussed earlier now
03:20let's take an example for
03:21dmips if a 100 megahertz cpu
03:26completes the benchmark program means
03:28the dry stone program
03:30200 times faster than the vex
03:331170 does then it would be considered a
03:37200d mips machine i hope this example
03:40helped
03:41do you understand the dmips completely
03:43now let's go to the next point
03:45for mips the mips is less reliable
03:48parameter
03:49to measure computer performance because
03:52it is architecture dependent the mips
03:55value may vary on risk
03:57and cisc architecture and it is
03:59dependent on the instruction
04:00execution cycle on the other hand the
04:03dmips has some defects
04:04but still widely used method to measure
04:07performance
04:08due to the simplicity and more accuracy
04:12the maps tells us about the speed of
04:14execution of a particular
04:16instruction by that cpu
04:20but the dmips tells us about the actual
04:23work done by the cpu
04:26now let's take the other parameter which
04:28is the d maps per megahertz
04:30so by dividing the result of t maps
04:33calculation
04:34by the frequency of particular cpu
04:38you can obtain d mips per megahertz
04:41which can be really useful when you want
04:44to compare the performance
04:46of your cpu at different clock speeds
04:50so the takeaway from this session is
04:53the dmips is the number of times
04:56dry stone program or the standard
04:59program
05:00executed by any cpu
05:03i hope this session helps you to
05:05understand the dmips
05:06completely if you have any doubt
05:10please message us thank you
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FAQs about This YouTube Video

1. What is DMIPS and how does it differ from MIPS?

DMIPS is a performance parameter that measures the execution of a standard program by a CPU, while MIPS measures the execution of millions of instructions per second. DMIPS is more accurate and widely used despite its defects, and DMIPS per megahertz is useful for comparing performance at different clock speeds.

2. Why is DMIPS considered more accurate than MIPS?

DMIPS is considered more accurate than MIPS because it measures the execution of a standard program by a CPU, providing a more practical benchmark for CPU performance. It takes into account the time required to execute real-world code, making it a more reliable measure of processor performance.

3. How is DMIPS per megahertz useful for comparing CPU performance?

DMIPS per megahertz is useful for comparing CPU performance at different clock speeds because it normalizes processor performance based on clock frequency. This allows for a more accurate comparison of CPUs running at varying clock speeds, providing insights into their efficiency and execution capabilities.

4. What are the drawbacks of DMIPS and how are they addressed?

One drawback of DMIPS is that it may not fully represent the performance of a CPU in all scenarios, as it focuses on a specific standard program. To address this, benchmarking tools and real-world performance tests are used to complement DMIPS measurements, providing a more comprehensive understanding of CPU capabilities.

5. How does DMIPS impact the performance evaluation of embedded systems?

DMIPS plays a significant role in the performance evaluation of embedded systems, as it helps assess the efficiency of CPUs in handling standard programs. It provides valuable insights into the computational capabilities of embedded processors, aiding in the selection and optimization of hardware for specific applications.

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