Yu Bubbling: I am a little dissatisfied with what I wrote earlier, I can't pick it up, it's all boring explanations. There are still in the afternoon.

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Recently, it is a bit strange that the successful trial production of the 757 prototype can enter the next step of the plan, but new problems have plagued everyone in the development team.

Since the prototype has successfully run the whole test, it is not very stable, it is intermittently crazy, and it runs smoothly when it is fine, but there will always be random wrong data at some point, and in severe cases, it will cause a crash.

Wang Suo: They almost disassembled the entire machine and reassembled it to no avail, the blame is that this kind of mistake is random, maybe there is no movement for a week, and if the attack occurs, it will not be able to work for a day, which is very nerve-wracking.

The hardware review is nearing completion, and the team has almost rebuilt a new machine, and this situation is still happening.

Naturally, people's eyes are focused on the software, after all, this kind of compiler was made by Cao Changjiu alone, and it is still in the international leading state, and others still don't quite understand.

Wang Suo was also suspicious and asked Cao Changjiu's opinion.

Long shrugged: "How do I know, the source code is here, you have all signed and agreed, you are always an expert, do you think there can be a problem with this thing? All tests are running the same program, it is impossible to run it once today, and run it again the next day and make a series of errors." To say that there is a problem with software compilation is IMHO to say that it is irresponsible. ”

It's not that Wang Suo doesn't understand this truth, but if he cares, he will be chaotic, and anyone who encounters such a mindless thing will be blind. I had no choice but to continue the investigation, and the dead horse should be a live horse doctor.

Cao Changchang also felt strange, this kind of random error feeling is so familiar, this situation will occur after the aging of the PC in the dream, which is generally caused by the aging and instability of integrated circuits such as CPU or memory.

But is this the reason for the large opportunity? Cao Changjiu didn't know much about this, and he didn't know the situation, so he just told Wang what he thought.

Wang thought for a while and shook his head: "If it is a problem with the processing unit and memory, why do we all reassemble a machine, and the problem still exists? Moreover, the integrated circuits we use are all specially supplied by Shanghai, and I dare not say that they are one in a thousand, and they are also military supplies with extremely strict testing, and each component is individually packaged and numbered, and the possibility of their problems is almost zero." ”

"What could be the problem, sometimes good and sometimes bad, could it be that this is like a woman once a month?"

"Vulgar! How can you be so young and go to work. The king rebuked angrily.

stuck out his tongue for a long time, and before leaving, he didn't forget to say: "You should always check and check the integrated circuit, our country's manufacturing process is not up to standard, anything can happen, I'll go and see what the problem is with the compiler." ”

The matter dragged on like this, and this problem was not solved until Cao Changjiu completed the logical design of the CPU. The development of Project 757 has reached an impasse.

Wang had no choice but to ask for help from universities and research institutions across the country, and for a time there were many people who responded to the problem, and experts from all over the country came to Beijing for consultation, which is known as the 78 Conference in history.

Shanghai, as the main supplier of components, also sent a team of experts, Cao Chang looked at the list, and Li Mengyang's name was impressive.

This can make Cao Changjiu very happy, there are not many people he knows who can make CPU layouts, Li Mengyang is one, he is worried about how to find him, and he can't imagine that this guy will be sent to the door by himself.

God-level figures from all walks of life gathered in Beijing, and all of them were famous and surnamed computer seniors in the country to discuss the development direction of Huaxia Computer.

As the host, Wang naturally brought the gods to the computing institute to visit the latest achievements of the 757 project - the 757 prototype, focusing on the new technologies and components used in the prototype.

After hearing that the 757 prototype uses the most advanced vector pipeline technology and parallel compilation algorithm technology, the floating point operation speed easily exceeded 25 million times per second, and they were all happy and amazed.

After the experts calmed down a little, Wang Suo sighed lightly and talked about the difficulties he was encountering.

What level are the gods, as soon as they heard this, they knew what was going on, and they asked if they had checked the hardware.

The king was not taboo, not ashamed at all, and said: "I won't tell you, I've exhausted all the methods, and I really can't find anything wrong, just like this machine is emotional, it's just a good pour, just come to say, it's completely random failure, no rules to follow, intermittent, unthinkable." Now this problem has become a major obstacle, and no progress has been made in the research work for a month. ”

After listening to this, the experts analyzed the reasons according to their professional help, analyzed and analyzed, and finally pointed to the memory integrated circuit.

The memory uses the latest 16k random access memory (DRAM) developed and manufactured in Shanghai, although the cost is high, but the performance is superior, the stability is high, and it is many times better than the core memory.

As soon as the experts in Shanghai heard it, they didn't let it, "Our products have a high degree of integration, although we dare not say that they are 100% perfect, but the DRAM supplied to the 757 project is all screened, and the test time has reached 16 hours, there is no problem at all, and the products that cannot pass cannot be shipped out of the factory." ”

Who is not an expert here, the result of the discussion now is the problem of memory, the data randomness error seems to be DRAM unstable, and someone immediately proposed to take the DRAM chip in the prototype out for testing.

The experts in Shanghai were annoyed, but they agreed in the spirit of science, and although they also suspected that it was a problem with the storage part, they were confident in the quality of the chips that came out of their hands.

The components of the 757 project are all localized, almost all the major computer factories in the country are involved in it, 16K memory is responsible for the Shanghai side, due to the high degree of integration, although the Shanghai side has been successfully developed, but the yield rate is amazingly low, only 20% or less, so the short man is selected as a general, and a batch of excellent quality is screened out to supply to the 757 engineering group to manufacture large computers.

This time, everyone suspected that there was something wrong with the DRAM they produced, and of course the Shanghainese people were not convinced, so they tested it, what is this!

Soon the DRAM samples were dismantled for routine testing, and experts came together to exchange their experiences. Time passed minute by minute, and in the blink of an eye, it was afternoon, and after nearly 6 hours of testing, there was no problem with DRAM.

The gods couldn't help but wonder if there was something wrong, and there was nothing wrong with DRAM? The experts in Shanghai sneered and drank tea there.

Just when the experts were at a loss, the tester came over with a record in his hand and whispered a few words to Wang, who looked at the record and was inexplicable.

The crowd stood still and looked at the king, waiting for his explanation.

Wang Suo coughed lightly and passed the record in his hand: "Just now our testers found an unexpected situation, a DRAM chip suddenly lost its function during the test, but it quickly returned to normal, I don't know if this is the reason." ”

The experts, who were originally like a pool of stagnant water, suddenly came to their senses and came over to read the records, but the experts in Shanghai were blue and couldn't understand why such a thing happened.

Everyone read the record and expressed their opinions. It's a strange record, and for a short moment, the DRAM seems to fail.

There are different opinions, some say that the quality is defective, some say that the heat is burned, and some say that the DRAM technology is not mature, or use the magnetic core, and the Shanghai experts who listened wanted to throw the cup.

Cao Changjiu was also wondering, thinking, it seems that this is the reason, but why is there such an instantaneous randomness failure? This seems to be a bit interesting, as if the cosmic rays have shone through.

I remember reading an article in my dream for a long time, which said that the computer chips used in aerospace are reinforced with special treatment to shield cosmic rays, otherwise they will fail. The article also talks about the test of cosmic rays irradiating integrated circuits, which seems to be somewhat similar to the current situation.

But Cao Changjiu couldn't figure it out, one of the planets in the solar system in the Milky Way, China's Beijing Computing Institute on Earth, seemed to be not far from the ground, how could there be cosmic rays, even if there were, it was strong enough to kill the integrated circuits?

Cao Changjiu whispered his suspicions to Wang, but before Wang could express it, he was heard by a few people next to him, causing laughter.

Someone burst into tears and laughed, "It's also cosmic rays, kid, you've read too much science fiction." ”

Cao Changjiu's face was flushed, annoyed and angry, and he was about to sneer at each other, but he didn't expect a person next to him to speak.