DeepSeek publishes DSec elastic-computing sandbox infrastructure tech report for large-scale agent training

DeepSeek has published a technical report on DSec, its elastic-computing sandbox infrastructure for large-scale agent training. A single extended shard comprises about 160 servers, 30,000 CPU cores and 250TB of memory; with multiple shards in production, DSec serves around 3 million sandboxes daily, with peak concurrent use above 380,000 and creation rates over 5,000 sandboxes per second. The company says DSec supports all training, evaluation and data preprocessing for DeepSeek-V4, achieving over 50x resource oversubscription. It uses three-layer image splitting, on-demand loading from 3FS, virtio-pmem/DAX memory sharing and tiered CPU scheduling, and offers FnCall, Container, MicroVM and Full VM execution backends with pack_diff trajectory forking. DeepSeek is also hiring engineers for the team.

Original sources (Chinese)