The mainland's billion-yuan supercomputer might be the most powerful in the world, but some researchers say its benefit to them is limited by its high operating cost and a lack of software.
Tianhe-2 last week held onto its first-place ranking in the Top 500 charts, which measures the capacity of the world's supercomputers. It performed at a sustained 33.86 petaflops, or quadrillions of calculations per second.
But all that muscle is not translating into practical use, some potential clients say. One problem is cost. The electricity bill for the machine at the Sun Yat-sen University campus in Guangzhou runs between 400,000 yuan (HK$485,400) and 600,000 yuan a day, which ultimately falls to the user.
Another obstacle remains a lack of software, they say. Tianhe-2 has been used for railway design, earthquake simulation, astrophysics and genetic studies. But so far investment has focused on hardware, forcing clients to write the programmes to allow them to use it.
Some voiced their criticisms yesterday in a meeting with Guangzhou's deputy mayor, Wang Dong.
"It is at the world's frontier in terms of calculation capacity, but the function of the supercomputer is still way behind the ones in the US and Japan," said Chi Xuebin, deputy director of the Computer Network and Information Centre under the Chinese Academy of Sciences.
"It's like a giant with a super body but without the software to support its thinking soul," Chi said. Some users would need years or even a decade to write the necessary code, he added.
Tinahe-2 was developed by the National University of Defence Technology at a cost of 2.5 billion yuan, and began trial operations in April. It has so far served 120 clients at 34 per cent of its capacity.
Chen Dongmin, a professor at the Academy for Advanced Interdisciplinary Studies at Peking University, also voiced concerns over the cost to use Tianhe-2. "It should be truly applicable to fields beneficial to society," Chen said.
Chen urged the city government to come up with ways to attract international and high-profile users rather than focusing on covering the supercomputer's bills.
According to Professor Yuan Xuefeng, director of the National Supercomputer Centre that manages Tianhe-2 in Guangzhou, the machine takes one second to finish what 1.3 billion personal computers would need 1,000 years to complete.
Yuan said they were aware of Tianhe-2's shortcomings. "The bill might be large at first but calculations by Tianhe-2 can drastically shorten years of experiment time," Yuan said.
The centre would seek to cultivate young talent in software programming, Yuan said.
Wu Hequan, a fellow at the Chinese Academy of Engineering, said last month that China's lack of "core technology" posed a potential cybersecurity risk as it still relied heavily on imported silicon chips.