ISRO Scientist/Engineer SC (Computer Science) case studies
ISRO Scientist/Engineer SC (Computer Science) · Put your knowledge to work in context.
The ISRO Scientist/Engineer 'SC' recruitment in Computer Science is the entry route into India's space programme for engineers who want to build software for satellites, launch vehicles, ground stations and data centres. The post is advertised by ISRO's centralised recruitment board, and selection begins with a written examination in the discipline; candidates who clear it move on to whatever further stages that advertisement specifies. The ISRO Scientist/Engineer SC (Computer Science) case studies are 5 cases and about 3,819 words.
1Top-10,000 Selection From a 17 GB Single-Pass Log
The ranking team must emit the 10,000 highest-scoring records from a 180-million-row nightly log. Records are fixed 96 bytes, stored in one file of about 17 GB; the machine that processes it has 4 GB of RAM and a single 200 MB/s SSD, and the file can be read only once because three downstream jobs consume the output at 05:00.
751 words, about 4 min2Throughput Collapse After Raising Worker Concurrency
A monitoring service on a 16 GB Linux host runs 40 worker processes, each with a measured resident working set of 350 MB in its hot loop; the kernel and page cache together need about 3 GB to keep the log shipper healthy. At 20 workers the host sustained 85% CPU utilisation and 1,900 requests/s.
698 words, about 3 min3Two Doctors Withdraw and the Night Shift Empties
A hospital roster service runs on PostgreSQL 15 at the default READ COMMITTED isolation. The table on call(shift id, doctor id, on duty boolean) has a primary key on (shift id, doctor id), and the business rule is that a night shift must never drop below two doctors on duty.
823 words, about 4 min4The 1 Gbps Backup Link That Delivers 6.5 Mbps
A branch office is 40 ms from the data centre, so round-trip time is 80 ms, and the path is provisioned at 1 Gbps with negligible loss. A single long-lived TCP connection copying backup data never exceeds about 6.5 Mbps, while four parallel streams reach 26 Mbps.
717 words, about 4 min5L1 Associativity Versus a 32 KB Stride in a Column-Wise Kernel
A signal-processing kernel walks a 64 MB array declared as int a[4096][4096] column by column, and it touches only even-numbered rows, giving an effective stride of 32 KB. The core has a 32 KB, 64-byte-block L1 data cache, a unified 512 KB L2 with 12-cycle access, and 180-cycle main memory.
830 words, about 4 min