Apa iku performance testing?

Question

IT Interview Practice · Accepted Answer

**Performance testing** ngevaluasi kepriyé sistem performa ing bawah beban — ngukur **kacepatan, skalabilitas, lan stabilitas** ing macem-macem kondisi. Jenis-jenise kalebu load, stress, spike, lan soak testing. Iku penting kanggo mastiake sistem bisa nangani panggunaan real-world (lan peak) kanthi terima.

## Apa sing diukur performance testing

```text
Non-functional testing of HOW WELL the system performs (not just correctness):
  → RESPONSE TIME / latency (how fast?), THROUGHPUT (requests/sec handled)
  → SCALABILITY (behavior as load grows), RESOURCE usage (CPU, memory)
  → STABILITY under sustained or extreme load
→ ensures the system meets performance requirements and handles real usage.
```

## Jenis-jenis performance tests

```text
LOAD testing → expected/normal load → does it meet targets under typical usage?
STRESS testing → BEYOND normal limits → find the breaking point; how it fails/recovers
SPIKE testing → sudden sharp load increase → handles bursts? (e.g. a flash sale)
SOAK / endurance → sustained load over a LONG time → finds memory leaks, degradation
SCALABILITY → how performance changes as load/resources scale
```

## Carane lan alasan

```text
✓ Tools: k6, JMeter, Gatling, Locust → simulate many virtual users / high request rates
✓ Define performance REQUIREMENTS/SLAs (e.g. p95 latency < 200ms at X users) → test against them
✓ Test realistic scenarios; measure under controlled conditions; find BOTTLENECKS
✓ WHY: poor performance → bad UX, lost users/revenue, outages under load; find issues
  BEFORE production (e.g. before a big launch/traffic event)
```

## Apa iku penting

Nglurungake performance testing iku ilmu tingkat senior sing berharga amargi **performance iku atribut kualitas sing kritis** — sistem kudu bisa nangani beban real-world lan peak kanthi terima — mula testing iku penting kanggo reliabilitas lan pengalaman pengguna, saengga ilmu iki berguna.

Performance testing ngevaluasi **kepriyé apik sistem performa** (response time, throughput, skalabilitas, panggunaan sumber daya, stabilitas) ing bawah beban — kualitas non-fungsional sing beda saka kabeneran, nanging kritis amargi performa sing ala nyebabake UX sing ala, kehilangan pengguna lan revenue, lan outages ing bawah beban.

Nglurungake **jenis-jenis** lan tujuane iku kunci: **load testing** (verifikasi performa ing bawah beban sing dikarepake), **stress testing** (nyorong ngluwihi wates kanggo nemokake titik pemecah lan kepriyé sistem gagal/pulih), **spike testing** (nangani lonjakan dadakan, kaya flash sale), **soak/endurance testing** (beban berkelanjutan ing padhang wektu, nemokake memory leaks lan degradasi), lan scalability testing — masing-masing jawab pitakon sing beda tentang kepriyé sistem mawa tumindak ing macem-macem kondisi.

Nglurungake **carane lan alasane** — nggunakake tools (k6, JMeter, Gatling, Locust) kanggo simulasi beban, nemtokake persyaratan performa/SLAs kanggo test (conto: p95 latency targets ing jumlah pengguna tartamtu), testing skenario sing realistis kanggo nemokake bottlenecks, lan kritis banget nindake iki **sadurunge produksyon** (utamane sadurunge peluncuran gedhe utawa acara traffic) kanggo kekarepakake performa issues sadurunge padha nyebabake kegagalan nyata — ngrembaka nilai praktis.

Performance testing nyegah skenario mahal ing mana sistem gagal ing bawah beban nyata (peluncuran kracak, situs alon-alon hanggang ora iso digunakake ing padhang traffic).

Sabab performance iku atribut kualitas kritis (karo performa ala nyebabake ala bisnis lan UX nyata) lan performance testing (load, stress, spike, soak) verifikasi sistem bisa nangani panggunaan nyata lan peak sadurunge produksyon, lan sabab nglurungake jenis-jenis, tools, lan nilai iku penting kanggo mastiake sistem performa ing bawah beban, nglurungake performance testing iku ilmu tingkat senior sing berharga — penting kanggo verifikasi kualitas non-fungsional kritis, mastiake sistem nangani panggunaan real-world, lan kekarepakake performa problems sadurunge padha nyebabake kegagalan produksyon, ngrembaka lebar kekhawatiran kualitas sing ditangani insinyur senior.

Pitakon sing gegandhengan